Not sure why you're being downvoted. Sure, maybe you're not going to have a need to open an assembly dump of your browser very often, but plenty of projects have multi-megabyte text/data files that need to be opened now and then.

One of programs I develop uses a dictionary that when unzipped is ~8Mb. Sometimes I need to open that up in an editor and it's nice not to have to fire up a different editor to do that.

In fact this is one of the first things I do when trying out a new editor - see how well it can handle files > 1Mb in size.

Maybe if you're only working on small projects with small files this isn't such a concern, but there are plenty of people who have legitimate concerns if an editor can't open large files (and 1Mb isn't even large).