Well, Meiling has Healer for when status effects still matter (assuming you aim to make most members who stay out for more then 5 seconds immune to them, and everyone on PAR since :Iku:), and a self-heal. The rest of the time you probably want your tank to be a switch-slave anyway. It's part of the reason I find Tenshi bleh to use, she's super slow. (That and against certain moves she falls over. She -can- break a few fights, though.)
I do eventually switch to Yuugi though because super high affinities can completely replace the MND stat, especially in late Plus where you can pump them with SKP/gears very effectively. In Plus, Healer actually becomes a decent heal, though... really, I'm talking about 30F bosses when I talk about switching to Yuugi. It'd be completely realistic to do earlier though.
As for Komachi Tank, I never, ever liked that idea in actual play. She has very high HP, but takes massive damage from everything. It's nice because she can take several hits before going down, reliably, but it's too much maintenance to actually keep her out as a tank. She's good for being a spongy person with a nice variety of moves, though. (DTH for randoms, Avici for a variety of situations, and Scythe for a decent SPI nuke)