I wouldn't want to say you must try again, but if you're interested in playing more with the toy for nerds, the Mobian wiki [0] is full of helpful tips.

You're right, lots of things don't fit the screen. Running

    scale-to-fit firefox on [1]

would fix your issues with Firefox not scaling correctly, for the most part. The other person that replied to you is right - it's currently a toy for nerds more than a drop-in replacement. With compromise and some effort (such as running your own Matrix server to replace Signal / Whatsapp / Discord), it can be done. But I'd hope to inspire you to try again, while tempering expectations for just how ready mobile Linux currently is :)

[0] https://wiki.mobian-project.org/

[1] https://wiki.mobian-project.org/doku.php?id=tweaks&s[]=scale...