Chrome does it, so it must be good? Is a extra 200mb going to cause the computer to choke? probably not, but that doesn't mean people cant complain about the fact that a lot of modern software has gone this route and it all does add up.
While sure, the comments can often be hostile to ai, warranted or not, AI stuff is consistently upvoted and makes it to the top ranks all the time. It not doing well can be as simple as posting it at the wrong time of the day.
I have always found sublime to be the best at large files, well over 1gb. Since you mention bbedit, maybe this is some mac specific issue? I really don't know. But at least among people i know, opening large files has effectively become its main USP.
Should be noted that the linked post is almost 15 years old at this point too, so perhaps not the most up to date either.