I have become sensitive to input lag, that always has been a thing with more complex text editors, and being a coder too, not just a writer, I already have a text editor I enjoy called notepad++ where I do most of my writing, it has syntax highlighting and spell checking, if I want that, but for writing and reading stories I prefer as plain text as I can get, so I just write in notepad++, if I want to do anything fancy I can do that later in libreoffice, or other programs that can read .txt files, and if any editor can't handle .txt files it is not worth installing it anyway.
Notepad++ is also nice since it runs just fine on my potato (read ancient) computer, so that is also a reason why I want something light. It also does tabs and handles even large text files for me just fine, a few of my stories have gotten larger than megabytes of plaintext in a single file. Putting that into word or other clumsy heavy programs would just murder the potato computer right away, from past experiences
I also sometimes put things into google docs, but mostly when I want to share it with multiple people not belonging to a site in particular, and usually I still write in notepad++ before putting it in google docs.
I am not sure how many people feel like getting that low down with no formatting or anything, I mean markdown files are sort of that way too if you don't have a fancy editor for them.
I also tend to write html and php and javascript and other code in notepad++ not fancy ide programs, again due to how much lag all the bells and whistles cause, I mean yes it is cool to get an api reference while typing code, but not if it takes half a second for each word written to finish.
For that reason when I am writing fast I also sometimes turn off spell checking, to not slow down the experience.
In ancient times with even more ancient computers I even sometimes typed so fast that the computers would end up beeping due to too much input at once, at least my potato does not do that, I may have gotten a bit slower with age though