[Xiaomi Poco X3 Pro] Akinaro:
1) under load it gets very hot. Throttling...

Every phone get hot, its just that some of them have metal/glass back that dissipate heat better. And yes, phone have thermal paste, just like cooper plate inside.

Does it throttle cpu? probably yes.

Does it make games lag? Not really, its more depend on game, and people often forgot that games lag because of crappy optimization, you cant blame phone because game use AO or motion blur shaders that where made for PC unity games not android... And yes, Genshi Imapct can lag on max, but it do that even on S21. because... yes, lack of optimization. Also Most of settings doesnt bring any real difference in look, so just because you can set something to max it doesnt mean its good and you should do that. its often small changes impossible to see on phone screen.

Just by running Antutu benchmark few times, you see how score drops over 100K.

So what? Benchmarks are useless, and annoying and have nothing to do with reality. Its like trying to drive your car 200kmph for 24H... you never gonna do that in real life...I can get from my drawer old iPhone and run benchmark, it get crappy results but still beat some of Android devices that technically have better hardware in every day tasks and gaming... why? Because benchmarks are useless...

2) Touch issues

I only had chance to use only 3 poco devices, mine, and two of my friends. Never heard of touch issues...

3) lags in games, Laggy UI, delay when scrolling

Not really, as I wrote in point 1. Its all depend on game and optimization of it. Laggy UI? Nope. But I need to say that Im not fan of Xiaomi UI. its annoying in some places...

4) fast battery drain

Without any battery otpimization on and 90Hz enabled(changed from 120 using SetEdit) and every day gamming before sleep and constant use of NFC and GPS I get.... the same as other phones, about 2 days. With battery optimization and less gamming I could probably get more...

Most of battery drain problems that some people had was related to one of update phone got and probably lack of any... technical hygiene... I often see people that have no idea how to treat phone or car... those two things have much in common and people are disgusting sometimes on how they use cars or phones... Im not gonna even mention chargers and cables... People seriously often use some weird cracked chargers and bend in all directions cables with smashed connectors.... Disgusting...

5) network Issues, unstable data connection

Here I need to say that its more software issue for most of time. I dont know if all Xiaomi devices have that but Poco have really crappy wifi management, it often doesnt switch to more powerful signal, it take ages to refresh wifi list, as it doesnt actually search for it in the background and it often want to switch to mobile data... But as far as speed and stability is when it have good signal... No complains here.

6) unexpected shutdowns, screen freezes

Never heard of that honestly....

7) back panel vibration when audio is playing

Its more about sound that hit that specific note and loudspeaker just cant handle it. I tried to play some heavy loud music but beside cracking loudspeaker that cant handle much more I dont see problems here. Im actually surprised how good speakers on Poco x3 pro are, far from perfection but for phone? good and loud.