Atom is a text editor and logs are text files that may need to be edited. It's not unreasonable to expect a text editor to be able to open the various text files littered through a system, and it obviously is a problem to a lot of people. I know that for me personally, I sometimes end up wanting to mangle logs in ways where grep falls short and stream editing with sed or awk is either more cumbersome than using the various tools at my disposal in vim, or just beyond my understanding of these tools.

I can open larger files with emacs, nano, vim, nvi, ed etc., so I think that it's fair to say that the limited buffer size plaguing Atom is a solved problem generally. Somehow it has a built-in package manager, but falls short of ed on very basic text editing facilities.