F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform. The client makes it easy to browse, install, and keep track of updates on your device.
I have a lot of complaints about this too, but namely lack of seamless updates is baffling to me.
Luckily I found Droid-ify and solves both those problems. Also has the common repos frequently added, like IzzyOnDroid, easily pre-available to enabled in the settings.
This definitely replaced the archaeic fdroid client for me, they desperately need an overhaul as it's a terrible first impression.
I sure hope not. No no no. Material you is ugly, and in 99% of apps not an option, but a forced changed. No need for that. It looks good enough for an app store.