Personally I like to keep to about 10-15 tabs open with the files I am currently working between. This set of files changes every couple of hours to I can't hold them in memory and it is good to have a nice visual reminder of where what I am looking for might be (bearing in mind that a lot of the time I can't think of the name for what I'm looking for).

Generally, when I'm working on a specific task that affects a handful of files, I'll have all of those files open in tabs. This provides a visual cue for each file (i.e. I know the "main" file is in tab position 1, the class that it calls is in tab #2, etc etc).

Furthermore, I can switch between tabs quickly with cmd + 1, cmd + 2, etc, or via cmd + option + left/right arrow. This can be quicker than fuzzy matching (which sublime text supports, btw), and it requires less mental overhead of remembering what the file is called when you want to switch to it.

I tried the whole "never close anything and fuzzy match to change", it never worked. I always end up thinking "what was that file i was editing 2 minutes ago called?"

I tend to cull open tabs when I have more than ~10 open. I guarantee I can look at my tab bar, move my hand to the mouse, and click on the tab I want faster than anyone can switch using fuzzy matching

I try to always have a set of at most ~5-6 files I'm actually working on (depends on the kind of work I'm doing but in most cases that works pretty well). I can then use Cmd+1/Cmd+2/... to switch between them which is way faster than any fuzzy matching (which I would use to switch to a different file). I work on many projects with very similar file names/directory structure which makes project windows (globally) and tabs (project locally) very nice.

I had accidentally copied and pasted the wrong one.

edit: this explanation was for the pre-edited point:

  When the last file is closed, a new transient file is created automatically

before when you closed all tabs you were left in this weird state where there was no buffer to type in until you created/opened a file.

Now it behaves as if you'd just opened a fresh window, where you have a buffer that becomes an "untitled" tab the moment you type something.

I believe it means hat when you close the last open file, it opens up and empty, unnamed file instead of just closing the window. The same behavior as opening the editor with no files to restore.