User numbers are small because an RPi3B+ is not a huge amount more $$ and is a considerably better Kodi device. RPi0 has never been positioned as an HTPC board and the only reason we "support" installs on it with LE 9.2 and older images is it happens to use the same image as RPi1 devices and thus needs no effort. Using MMAL in LE 9.2 is sub-optimal so most users are forced to use OMX anyway (same for RPi1) so Kodi is pushing the limits of what's sensible on the low-spec Pi boards for a while already. LE10 formalises that reality by discontinuing support completely.
If OSMC works better for you that's great and we encourage you do us it. OSMC currently runs the same underlying kernel, drivers and Kodi version that we use in LE 9.2 so there won't be any major difference, but the packaging might be easier for you. NB: In the near future they will make the same decision to end support for RPi0/1 as LE because they will migrate to the same K19 code stack that we're developing for Kodi. K19 does not support OMX or MMAL, only GBM/V4L2, so the decision is technical and nothing to do with user numbers.