Seer is overpowered

After playing many rounds I think that the Seer disturbs the gameplay and is definitely broken.

Problem 1: Everyone sees everyone.

Hackers do the exact same thing. There is simply no fun in it when both teams see each other. And considering how overpowered the Seer is, every team will have it in their team.

Problem 2: Damage from his tactical ability, which can be used every 30 sec!

It is simply annoying that it costs nothing to hit other players through the walls. How can I defend against it? What if all teams in the last circles have Seers. How many batteries do I need to stand a minute in a close proximity from other teams.

Problem 3: Passive is just another hack

Why do we ever need the Bloodhound. I get it, that there are nuances in how their abilities work, but Seer literally sees the heartbeats in such huge area non-stop. No way to hide and it makes other legends kind of useless.

Problem 4: Tactical interrupts healing

Again, how can I defend against it? In the game, where third partying is a part of the gameplay, it doesn't let you heal before the next squad attacks.