Aliairstinger

No.

you can put a launcher on any phone. launchers are like apps, just download from playstore, or any other store. 

You can put any aftermarket launchers, the bootloader doesn't have anything to do with it.
Now if you want to flash the thing with a custom rom, that's when you need to unlock the bootloader.

Be warned! Huawei is being an a** like all the other mainstream manufacturers now and NOT ALLOWING Bootloader unlocks on their devices (at least on the international version)! There are some sketchy Russian services to unlock them though, Root is very difficult with a locked bootloader and TWRP is near-impossible unless someone develops a safestrap-like recovery. It can be done but it's a long drawn our process.

If I'm being honest, there is one app called "MyTube!", I actually prefer that than the official youtube app. So I can't watch paid content or youtube premium, I only have one movie on google.

over 100 usd.

over 100 usd.

i'd say the ryzen 5 2600 and RX 590. the ryzen 3 will bottleneck vega so much in gaming,  and ryzen 5 2600x isn't worth it compared to normal 2600 given that you know how  to overclock the 2600 properly. although to be honest, my recommendation is for gaming purposes. i don't know much about editing. but if the pc can game, i assume it can edit great too.

cheers and good luck with your build.

Davinci Resolve (black magic) is free