I've read that about the 48kHz being for 24fps sync, but most of the video I see these days is from a phone, and that's 30fps.
Back before there were DAWs, and when I was just synchronizing my tape deck to the original Cubase sequencing program, I use to set it at 30fps.
It just made the most sense since it was comparable to real time.
Then I started working in a TV/video production job...when video was still done to tape, Sony Betacams, etc...and that's when all the oddball frame rate stuff really came into the picture for me...especially since we were also doing a lot of audio recording (narrations, etc) to add to the video.
That was right about the time the first Avid video workstations were coming out. A couple of us spent a week up in the Boston area at the Avid training center getting familiar with the editing capabilities...because no one had used any computer based editing before were I was working, but it was pretty simple for me, since I had gotten my first DAW setup like 1-2 years before that, so the editing concepts and application of FX/processing was already familiar.That's when I moved away from the Cubase sequencer, though for a short time I had the tape deck, the DAW and the Cubase system all locked up and running together.
I think that's about the last time I used 30 fps for sync purposes.
Now days I have my master clock box timed off of NTSC video blackburst, which is 59.94 (which is also tied to my Microlynx sync box)...so then 29.97 is my standard fps now, and that's what I set on the DAW for SMPTE.
It bugged me for awhile...not having that perfect division breakdown against my DAW timeline like the 30 fps did...but I don't even pay attention to it anymore.