When I'm tanking I feel really bad when the healer keep me at 100% HP at all times, It feels like I'm doing so bad that I need a babysitter all times, I feel like trash. Meanwhile when I see that the healer is able to DPS and keep me alive, even if I go under 20%, I feel confident, then I know that I'm doing a good job mitigating damage.

But that's just me.