A very simple problem that I absolutely hate in LibreOffice that I can't find a solution for. When typing in a formula in a spreadsheet and then trying to autocomplete it, you cannot use 'Tab'. If you want to do a vlookup and start typing "=vloo" and then hit 'Tab' it just changes to the next column. Working in Excel at work and then switching to Calc at home is jarring and terrible. That option can't be changed as far as I know. It's a complete dealbreaker for me between the two. Luckily I don't need to do much in my personal life on spreadsheets anymore or need to use my home PC for work like I used to.
I genuinely don't know how people are having their web browser use so much ram. How many tabs do you have open? Even at work where I run a commercial loan origination system and our core customer system in a web browser, at most I'll have 15-20 tabs open. I don't know how people are having dozens and dozens of tabs open that they're using 64 gb of RAM.