Yes that is exactly what I'm suggesting. If I'm browsing from my PC then all I want to see is games/applications that are developed with the PC in mind. If that means that I only see one game at the moment then so be it, I can have a quick glance, see if there's anything I might like or not and move on.
Even if its not on by default because people like you might one day have a burning desire to play Candy Crush on your desktop PC there should at the very least be a toggle that can be enabled to make it more customisable and user friendly.
Alright, let's take a quick step back here then. Let's pretend that I'm about to implement this toggle for you
right now. What criteria am I using to decide what to cull from your view of the store, based on the device you're using?
The main problem with your previous examples for iPhone/iPad and Vita/PS4 is that the store isn't showing you the equivalent of an iPhone app on your iPad... it's showing you what would essentially be
the iPad port of the iPhone app. In the Vita's case, this is basically Gravity Rush showing up on your PS4, but when you load it you're playing Gravity Rush remastered. Your argument would mean that this shouldn't actually show up for PS4, as the game was designed for the Vita.. regardless of the fact that it now renders differently on the new device, and has a control system that ensures the game is fully playable throughout. Candy Crush may be utterly worthless to you (it also is to me btw), but how is being able to play it on the PC really any different to me being able to play Threes on an XB1 (the only way I've ever actually played it)? The whole point about UWA is that the apps
are desktop apps as well. If they're not desktop compatible (including input support) then they don't show up for Windows 10 at all (and vice versa for Windows Phone). There's not really anything to separate Rise of the Tomb Raider from Asphalt 8 Airborne beyond budget and payment model (Asphalt being F2P). Put Asphalt 8 on an XB1 and it should (and would) get listed in the store alongside Halo 5, much like the port of Riptide GP was.
From a curation standpoint, they can (and do) feature certain games more prominently than others, and create categories/collections that group certain types of experiences. But there's really nothing device specific that makes any real sense to start throwing a developer's game out of the store listing based upon... it's basically just an extension of the "indie games aren't real games" argument. Loading up Steam right now, the first game it presented me with on its store was
Brushwood Buddies. Now in this case this actually doesn't appear to be a mobile game despite how it looks... however, if this were a UWA, the mobile version of this game would likely exist automatically... should it not show in the Windows Store when you access it from a desktop? See how arbitrary this shit is?
The solution isn't to try and filter games and apps based on device, because that just ends up getting stupid really fast (hide Netflix? Halo Channel? OneNote? etc).. it's simply to ensure that when the sort of substantial software that you're vaguely referring to get released to the store, they are easily noticed, and when there's enough of their sort, that they're easily located. This is definitely something they can (and really need to) improve on as more and more of these games hit the store, but that's more of a future issue than a "now" problem where there's very little of it to actually highlight. I would actually suggest that they use the Xbox App for this purpose. Currently the store portion of the app will show you both XB1 games, and Windows 10 games on separate tabs. The Xbox One titles are arranged in the same fashion they are on the console's store, but the Windows 10 section shows a small subset of the store's lineup, with a link to the full store to see all games. This would be a good place to fill out with games more specifically tailored towards core gamers... the sort of stuff they list
here. A game being more tailored for mobile wouldn't necessarily exclude it from this section, but the games being displayed would be more directly curated by hand, rather than simply by the usual metrics of what's selling most, or what's newest on the store. That way, someone like you can access the games from here in favor of the main store, and you'd be spared seeing a listing for Bloons Monkey Road. You'd still probably see Candy Crush though... simply because like Angry Birds releasing on consoles, it would likely have enough pull to get featured on any games platform.
EDIT: Actually the Brushwood Buddies thing wasn't entirely true. That wasn't on the large featured window. It was just below it on the "New on Steam: Featured New Releases" section. Still though, the point holds.