Nah they will never tune hp checks that tight in savage. As long as you have access to good healers and co-tank who's fine with doing multiple tank swaps for mitigation you won't need as much hp as those who don't (i.e. pugs). If tanks in good statics need 5 fending accs to live then pug tanks will die lol. Based on the clear rate the devs are happy with (creator savage clear rate) they'd tune savage raids to be within the reach of pugs.

I'll still go in with 5 fending accs at the start for the extra safety net, but after optimizing I would start switching them with slaying accs unless they patch 270 accs to be role locked (the most obvious choice for them, since allowing a 12k hp loss would just widen the skill gaps between good tanks and bad tanks just like in gordias).