Not sure why people focus on the feedback, the software is developed by Microsoft, if it was not ready or not good enough the problem is their code not the users.
Performance is related to the specifications of the phone, this should be obvious.
Feedback is not the cause, the cause is the bad support from Microsoft, I don't care too much about Windows 10 but this has been the last straw. I had an old tablet with Android and didn't like the OS, so with the phone I tried Windows, the lack of 3rd party support is a big problem, no app for the bank, wanted to buy something on wallapop and there wasn't an app, the other day I saw I could not try the new app from Nintendo, etc.
Ok, this was known but from what I had read I thought Microsoft was going to work hard to bring applications to the platform and to update the phones. What was happened in the last months? The new strategy to bring apps is the windows 10 store, they are abandoning the other plans, no windows 10 update for a lot of people, applications like Health, Food&Drink, Travel, etc are disappearing from my phone, others like Here maps are losing support, I had to uninstall apps like their PDF reader because it didn't work and that's all related to Microsoft . If we count third party applications the store is full of outdated ones, bad copies with low functionality and a lot of them are disappearing like Mix Radio another one that came installed.
But if Microsoft is the first one abandoning their users why should 3rd parties care about their ecosystem?
You can always blame feedback, the reality is that my Windows Phone is getting worse and it probably has the worst support of all platforms or wants to gain that title.