Not your screen monkey (he/him)
Except it is more complex than that - and in the barbarian's and fighter's favor. The barbarian's ability to take hit point damage from most sources doubles while raging, so +2 hp/level isn't quite the right factor. And the fighter's going to have a much better AC than the druid under the wildshape, probably negating about 20-25% of the hits he'd be taking compared to the druid (depending on form).I normally agree with a lot you say, but just no. Barbarians have 2 more HP/level and no spells. Fighters have 1 more HP/level.
So the druid needs something more than their own hit points as a wildshaped combatant. Maybe it's not 5x or quite what they had in 5e's version of wildshape, but stuck with their own hit points and low AC isn't right.