Well, edo tobirama is probably the strongest barrier ninja in our meta atm, at least for my power (280k). I would pick him 10 times over shisui.

As for tsunade, she is still the strongest group healer in GNW / bonds. In 1v1 she is quite bad, but her kit isn't really tuned for that.

Hashirama is still used in 9tails and his coming soon mutations will make him usable in pvp.

Tobirama has been mistreated since he got his SB, since we have never been able to get his will of fire +1 like for hashi, and he appeared in 1/10th of hashi's events.

I mean, you are totally right about the cool effect and the fact that this game has quite a record of bad pricing, but even if i would really like use kakashi for a few teams... none in 6-10 months will use him.