So far I have not found that to be a problem. High level tanks can take the pain even from the CR + 5 monsters I've thrown at them at times. This is of course assuming access to healing. If your party doesn't have that then its a different story.
If you mean access to a dedicated combat medic focused just on you, then you're right, I'm not assuming that.
Okay, then, no, using too-high CR monsters give unsatisfying results since players complain tanking strategies does not work.Oh no, nothing that extreme. Just a cleric with the occasional good healing spell, but you certainly don't need dedicated healing.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.