Magazine design and capacity isn't "how many cartridges can we stuff into this volume".
(1) You mention the Kel Tec CP33. For one thing, it's a rather large handgun. The G44 is designed to be a packable .22LR or a 19 trainer.
(2) The .22LR is a rimmed cartridge. You can't just jam them in a magazine, you have to ensure that the magazine is designed to position them properly so that the rim of one cartridge doesn't sit in front of the rim of the cartridge above it. The CP33 is susceptible to rim-lock, because Kel Tec didn't do this.
(3) The CP33 magazine is a double double-stack. The G22 uses a more reliable single-stack design. Most .22 trainers and serious target guns use a 10-round magazine for exactly that reason.
(4) 10 rounds of .22LR is going to satisfy most people just fine.
And no, before anyone chimes in that the "CP" in CP33 stands for "Competition Pistol", it is not. It's a toy.