You may disagree, but the market clearly doesn't. Look, I like mid-size tablets. They're large enough to actually use for document work, yet small enough to slip in a back pocket. But no one's released a decent Android-based example (AFAIK) since the Galaxy Tab S8. Outside of Samsung for models worth having over the segment's entire history, there was, what, the Nexus 2013 and Nvidia Shield? The situation was so bad when my N13 needed replacing that I just gave up and bought a G7 Power instead (was still rocking a dumb phone at the time), because everything available that wasn't an S8 or iPad mini sucked, and I didn't want to spend $400. The only conclusion I can come to is that there simply aren't enough buyers out there to sell enough units to produce a well-performing small tablet at a modest price point.
Side note: The only reason the N13 was so good at its price point was because Google basically sold it at cost, intending to make revenue via the Play store. That clearly didn't work out.