When working in tex files, I follow the rule
One sentence per line
because I think this gives the best diff sets using version control systems (usually mercurial or git) so that one can best see the changes of yourself and others to the file.
Anyway, many of my collaborators follow the rule
break lines after 80 characters
usually because their emacs or vi makes this best to read on screen (and because they are used to do so from the good old days).
I currently believe that, whichever editor people use, it should be possible to have lines displayed however people prefer without introducing newline characters in the source. In particular, one should not force collaborators to also stick to the personally preferred line length by using newline characters.
So my question is:
Are there good reasons for restricting lines to 80 characters when editing
tex-files, and introducing newlines to not pass that limit?
This is clearly a soft question and I have not actually checked if this is appropriate to ask here. The reason I do so is that this problem occurs (for me) only when interacting with collaborators on tex files, so I consider it to be very specific to latex collaboration.