This weekend marks two years since Amazon.com Inc announced it was acquiring Whole Foods Market. It was a thunderclap that demonstrated Amazon’s ever-growing ambitions and all but assured that e-commerce was about to rattle one of the last corners of retail to remain insulated from digital transformation. By now, Amazon’s fingerprints on Whole Foods are clear. It has expanded grocery delivery and online ordering into dozens of Whole Foods stores, cut prices on select items and offered discounts for Prime members. Those pricing moves appear to have changed people’s attitudes.

YouGov, which surveys shoppers about consumer brands, has found that Whole Foods’ value perception has improved meaningfully in the past two years, showing Amazon has chipped away at the “Whole Paycheque” reputation that had hurt the grocer as rivals perceived as more price-conscious, embraced organic food. By broadening online shopping options and selectively slashing prices, Amazon showed it could execute in groceries the playbook we already know it has mastered. But what about the aspects of running Whole Foods at which Amazon was untested? Things like in-store merchandising, customer experience and labour allocation?

On these merits, let’s be honest: Whole Foods still basically feels like the same old Whole Foods.

Amazon’s lack of imagination at Whole Foods is something we’ve seen repeatedly as the e-commerce giant experiments with physical stores. Amazon’s bookstores aren’t that different from conventional shops. Its 4-star knick knack stores are Hallmark gift stores crossed with Brookstone.

Amazon recently shuttered dozens of mall kiosks where it sold Kindle tablets and other electronics. Those Amazon formats sometimes seem to exist largely as outposts for people to return unwanted Amazon orders.

From Amazon’s earliest years, CEO Jeff Bezos has said that the company was interested in operating physical stores, but only if it had unique ideas. Apart from Amazon’s experimental cashier-less convenience stores, none of its other brick-and-mortar experiences live up to that promise.

Amazon executives have used the word “invention” to describe what the company has done at Whole Foods, but that is a generous assessment. In addition to expanding home delivery or in-person pickup of online grocery orders, Amazon has enmeshed its brand more with Whole Foods’s. People can buy Whole Foods products on Amazon, use an Amazon-branded credit card to rack up rewards, pick up Amazon packages at lockers inside Whole Foods locations, and use the Alexa digital assistant to start a Whole Foods order.

These integrations and establishing Prime as the loyalty programme for Whole Foods weren’t trivial changes, but they’re not groundbreaking, either.

Amazon says that “the goal has always been to make consistent, smaller innovations over time” to expand the Whole Foods mission of organic and quality food.

It takes time to change an established store chain, and there may be a broader vision for groceries that Amazon hasn’t articulated. In fact, it’s surprising just how little Amazon has said about why it purchased Whole Foods, what it has changed under the hood or future plans for its jumble of food offerings.

There may be no other public company that could spend more than $13 billion to expand into a completely new business, and tell investors little about what it was doing or why.

Shoppers haven’t been bowled over, either. YouGov data shows that US consumers’ willingness to consider purchasing at Whole Foods has settled right around where it was at the time the deal was announced.

Amazon also hasn’t been transparent about what financial improvements, if any, have resulted from its ownership of Whole Foods. Amazon’s reported revenue from its physical stores posted a 2.7 per cent decline in the fourth quarter of 2018 from a year earlier and a 1 per cent increase in the first quarter. The lack of detail makes it hard to have confidence that Bezos’s company has transformed the chain, especially when food, more broadly, seems to be a category that keeps bedevilling Amazon. It said this week it will close its four-year-old restaurant food delivery operation in the US, an admission that it had been outgunned by Grubhub Inc, Doordash and Uber Eats. It earlier pared back the footprint of its 12-year-old Amazon Fresh grocery-delivery service, which struggled long before Whole Foods was in its tent. Amazon won’t give up fighting for a much larger share of the more than $800 billion that Americans spend on food shopping every year, and Whole Foods was a big bet that physical stores remain key to cracking that market. What Amazon has done so far is to Amazon-ify Whole Foods in necessary but also obvious ways.

What’s perhaps surprising is that two years in, there have been few glimpses of new ideas that Amazon could bring to the supermarket shopping.