Apple updated the design of the AppStore web versions for iOS and macOS. It now looks more like the app design App Store in iOS 11.
The new design puts more emphasis on screenshots and reviews. Interestingly, screenshots from iPhone X are now displayed on application pages. In addition, you can now switch to screenshots from iMessage and Apple Watch.
Apple removed the App Store section from iTunes, so the app pages now indicate that they are only available in App Store for iOS. Also, the new interface has more highlighted similar apps, a 'what's new' section, best reviews, Family Sharing support, file size, price and more. What's more, it's now immediately visible on the app's page if it has received an Editor's Choice award.
The web interface was updated several months after iTunes 12.7 was released. The integration with App Store was removed from the new version for iOS. Not everyone liked the unexpected decision, and many problems arose because of it. In this regard, Apple released iTunes 12.6.3, in which the section App Store remained.
You can independently evaluate the updated design of the web version App Store for iOS at this link.