Fedora use 100% ram size. I have tried it on 4 GB system and it’s working good

Adobe Acrobat works for me using Bottles/Wine. Pirated and old version of course

With an SSD and enough RAM, I think old machines are more than capable for most basic task

I’m self hosting Vikunja for projects and use Joplin for notes. On my Android I just use Vikunja as a web app. It works fine but no notification