It does have a niche. People use it in ultimates and such. Its also not a 'bad' stat. Its a fraction off of det while providing mitigation. The only real problem is this games mitigation is very stromg and outgoing heal power is very strong. We dont actually need any more mitigation for 99% of content. But when times get tuff (ultimate), suddenly people find a use for mitigation.

It does its job. Players just dont care because tanks and heals are OP in this game. If you full build ten towards the end of an expac you can get large, permanent damage reduction. Id need to recheck the math but it was like 10 or 15%. Thats a lot of passive mit. But peopme would rather have 0 ten and do 5%more damage. Ten is fine. Its better than parry and usful when you actually want mit. players just dont want mit cuz tanks op.