I'm not sure where the PSR-12 line length come from, since 80 characters long seems to me as the most recommended one in it, I wonder if it comes from old computers from the old days where 80 "columns" where the most used in professional computers. Unfortunately I'm not from that generation.
In any case, I have grown fun of using the terminal and old computers, and it is nice to have a sort of a "standard" that we could use to read code easily even in such old computers.
While writing code, I always intent to keep this limit in mind, considering an indentation of 4 spaces. Some others might use a different indentation, but still try to have the line limit to 80 characters long. If tap where to be used, how will the programmer know where to stop?
I mean it might not be such a big problem now days, but I thought it was good idea to share. I'm sure it would be easy to implement an option on IDEs to wider indentation regardless of whether spaces or taps are used. Maybe even just make spaces wider or shorter would help wouldn't it?