Me , always as a stylus and note writer. Excellent alternative to Note Spen.
Desktop mode - never tried

Standby overnight 7 to 8 hours battery drain is mostly zero and highest recorded is only 2%
Usage SOT minimum is 11 to 12hours without gaming. On a 50/50 mix of LTE and WiFi

You gotta stop believing in US propaganda BS. There are no major Mate or Huawei specific flaws, only Android.

The UI is smoother than Samsung's. Don't just take my word for it, read it here.
https://m.gsmarena.com/huawei_p30_pro_long_...view-1999p5.php
Bugs? Have not noticed anything major as of now. I think only have a single bug which was related to display that I found in the course of my use. Nothing major, just a small issue which I can't remember now.

As for carrying the Pen around, I have not found a solution. It's inconvenient compared to Samsung's Note series. That's the only thing I miss from Samsung. But in return, I get larger screen, more versatile camera setup (whether better or not is up to debate, but they are really close), smoother UI and crazy battery life. After having Mate 20 X, I never once used my power bank in my travels. Minimum 10h SoT on the go.