It is an accessibility issue. The font size is too small. Not everyone can read 4 point font size. People can have poor eyesight or not able to buy new hardware because that's what you suggest.
You can just zoom-in or zoom-out the browser and show the text you want to see. That update is not necessary at all, this feature was raised too many times since 2014 and will not be prioritized as there are so many problems in this forum from scammers to spammers to be solved first, then you're going to add that.
You/people must wait until there's a
new forum software release which I don't know when it will happen. Or you can use this
mobile addon for android, only if you want.
Google penalizes web sites that are not mobile friendly so it's really a no brainier for theymos. More traffic means more ad revenue.
Theymos will not care so much about that IMO.