I'm at 471 apps and counting. Many apps were trials to see if I would like them while I searched for one that worked for me. I wanted to be thorough and check each app in a category to see which was the best. Now my list is littered with a lot of garbage I'll never use.
Yeah, hopefully W10 will fix it. I didn't even see how to find an "app history" in W10 Store Beta, only a "purchase" history, which takes you to your Microsoft Account page to show you what apps you have purchased in the past. No store list whatsoever, but at least you can get a list of what you paid for. I like that better. If an app is free, I don't need to keep a record of it anyway. If I like it, it will stay on my phone and be restored from backup should I ever reset, or, if I plan to do a clean reset without restore, I'll make a list of the ones I want to keep. Not that hard. For now, I just ignore the "My Apps" thing. It works best for me like that.