For the Show 20, in the market (accessed via web browser), there was an inventory tab that listed every possible card in and you could do a Ctrl + F and look for "x2" or "x3" or "x4" and you could directly navigate to all cards from one page. Cards you didn't own would have a "x0". That was really convenient. It allowed you to see all cards at a glance, search for ones you owned or didn't (and duplicates), and then you could drill into that card and make a buy/sell order.
For the Show 21, rather than show all cards in one page when you select the inventory tab, you only see 25 per page and you have to page through 77 pages to view your entire collection. The APIs the market use are also incredibly slow which makes going from page to page a bad user experience. It was slow last year too, but this years performance seems even worse.
All-in-all...the market could be a pretty neat game function, but in it's current state - it's more frustrating than rewarding to use - especially the browser based version.
OleDylan023, you're not being lazy - they're ignorant about how the market works and used to work and ignorant about how APIs work and just looking to discourage someone, rather than propose a solution or enhancement request.
All I'm saying is - It was much easier in the web browser of the market in MLB the Show 20 to see all cards (and which ones you owned/didn't/had duplicates). I'm not sure the logic that went into changing that aspect of the market from 20 to 21, but I really wish they would consider changing it back. The 21 inventory tab is pretty pointless, especially compared to the last year's version where you could see all cards (and their counts) in one place.