Health restore

IMO think this would be a tad too strong, this would make kill chaining much easier.

You can already shield-swap, which also includes some technical skill to pull it off.
Of course that's just shields and not health, but personally I feel like it would be a bit too strong.

Does shield swapping not prove useful enough to survive in-game? Or is there another reason to why you would like to see something that would restore health on kills?