One modern trend to mention with Acer/Asus
Is that they are moving to solid undertrays.
So no easy HDD/SSD/Battery swaps. You have to unscrew the whole bottom tray then separate the top tray, keyboard and trackpad then clip it all back together etc. to do what was a 2 minute job on any other laptop.
Not fun and eases them out of my 'recommended' list.