Rimfire pistols are generally (always?) blowback and getting one to run properly is a balancing act between weight of barrel/slide, weight of recoil spring and power of the cartridge .
I am thinking this balancing act gets more difficult as the pistol gets smaller.
All the good reliable rimfire pistols seem to start with a medium size frame and about a 4 1/2" barrel . Think of Ruger standards and Mark series, Buckmarks , Colt woodsman , S&W 41.
There are just a few good designs out there. Beretta had a tilt barrel that has a decent reputation , I own one in 22short , chunky little gun, it could use larger sights , but it is small .
I have seen various little pot metal junkers (raven/phoenix) that are hit or miss but generally not worth messing with.
I do agree there seems to be a opportunity for some maker to come up with a design
Years back I owned a S&W 2213 that was a pretty decent compact 22 . For the life of me I don't remember why I sold it . I sell very few guns. I believe it was only made in the 1990s