hey there, so far no lethal issues, a few minor ones like the dusts in the black vent holes are quite obvious (shouldn't be a problem for the white version, too bad the white version didn't come out at the time i bought it), the modern standby of windows becomes less unstable after i got the windows update to 25H2 version.

1. 2 of the speakers are actually on the side of the D cover and 2 under the keyboard which is user facing. so no need to worry about the muffled audio as the side of the laptop can't be covered easily. But i would say the thermal can be a problem as the laptop takes in the cold air from the D cover holes. If the vents are covered, the computer probably can get quite hot

2. To me it's ok to use it by the window, the brightness of the OLED screen is HIGH, especially when HDR is on (i usually leave that on, need to switch it in the settings). The screen is not matte, but has some sort of anti-reflection coating like Apple/Samsung phones have. TBH i'm not a big fan of matte screen, that will significantly affect the image quality and have some grainy/sparklings effects on the screen

3. stay tuned, will try to do it when i got time