Here is a breakdown of all heals that are used at TL5
Agent/Doc: CH is 10000HP/8s = 1250HP/s
Agent/Doc: life giving elixir 988HP(ave) /4.56s = 217HP/s +other heals
Advy: Moonbeam 911 (ave) /4.74s = 192 HP/s +phoenix
MA: Enlightened aura of healing 949(ave)/8.59s+red dawn= 123HP/s
Trader: preeminent health haggler (869-(229/2))/3.7= 204HP/s
Enforcer: Mongo Crush 230HP/2s +bio rejuv 35HP/s +blessing of life 400HP/50s =15HP/m + lifeblood 3360/300s= 169HP/s
Keeper: LoH+CT+amb rev+bio rejuv= 15HP/s+20HP/s+25Hp/s+9HP/s= 69HP/s
Fixer: omnimed exc. 199/5s+BYrevital 280/10s= 67.8HP/s +heal proc 37HP/s
Now consider the perk investment
LOH+CT+biorejuv =13 perks
none of the other heals listed require any perk investment except 1 for MA on red dawn (and bio rejuv on enf, but, the coon is far more important)
Finally, there is the comparison of activatable defences, ie, defences on demand.
Advy: 800evades +200evades +4600layers+ 192HP/s (11 perks)
MA: 800evades+200 evades+300 AAD+123HP/s (11 perks)
Enforcer: 4600 layers+ 169 HP/s (14 perks)
keeper: 4600absorbs+ 89 evade cls (20s) +21% reflect (16s)+ 69HP/s (13 perks)
fixer 800 evades +200 evades+ 300 AAD+ 68HP/S+procced 37HP/s = 105HP/s (11 perks)
Whichever way you cut it, keeper can't get enough 1. healing 2. (no SA) so lacks capping hit 3. needs 13 perks JUST to provide basic defences, leaving 4. VERY substandard offensive options through perks.
with 4 perks remaining to be put into reaver, our AR is limited, our damage perks suffer greatly, and still have 1. substandard evades, 2. substandard healing. 3. heavy reliance on HM line (which provides a FAR FAR FAR lower benefit for perks invested than acrobat), or coccoon, which instead of being an "emergency use item" becomes the "primary" defence.
TL;DR Version:
Keepers suffer lack of perks, gain moderate static defences, have a SEVERE lack of reliable and usuable activatable defences and the lowest HP/s at TL5 among melee classes.
MA/enf/fixer somewhere in the middle, and,
Advy miles ahead of every prof, with huge static bonuses, huge and best activatable defences, and the highest HP/s.