A lot of the "mainstream" apps simply do not exist on Linux. LibreOffice isn't so bad, but most people simply want Microsoft Office. Lightworks is decent software, but most people want Adobe Premiere. Gimp is alright but most people want Photoshop, etc.
This isn't to say that Linux software "worse", I actually like Lightworks more than Premiere, and there are some applications that are competitive with the "brand name" applications like Krita, but "having good software available" is only half the battle. People get used to certain workflows, and if Linux doesn't support that workflow most people aren't going to think it's worth it to switch over.
I do work in software, and I run NixOS, and I like it a lot, since programming tools on Linux are generally very good (especially if you work in server-land like I do). I'm just saying that I don't really blame people who don't want to switch over.