First : refess should gett something lawtia like, falkow like:
send unit to cemetery effects (mecriless) is lawtia: aano, Cathira, Alphonce (very good examples for lawtia like in refess), there are some others too mentioned in this thread.
But it gets even better refess is getting more and more falkow like things:
all the speedy units of last sets
SK is basically a field oriented falkow, super speedy, even buncles have many agi4 units
loock at the new ex buncle: It has pinpoint (falkow typical, antifalkow), agi control (falkowtypical, anitfalkow). and heal (refess) and openskill 1sp (new trend in refess, hurting falkow files by supporting to win the sp game).
Ex buncle not only collects many falkow-strenghs in one unit, it also one of the most clearest falkow hate cards concurring with shvara.
Noone can say refess doesnt ditch over good into other spheres (which is nice).
Then to DGs comment: you need to get rid of the idea to expect all spheres getting the same thing.
half of the spheres have no field concept at all:
If gowen gets a high hp unit it will have attack or agi, cause all gowen units are allround, Lawtia is a bit more difficult cause they are subtype wise swinging between fieldy and less fieldy, but even there a tank will be capable to do more then just tanking.
Refess is the sphere of tanks. It is trying to establish a filed by by stalling and surviving . Only controlling debuffers, "master buffers" or other vise control oriented units have low hp. Their tanks have a huge key role in making their files working at all, so no wonder they should have many good tanks.
and falkow.. falkow is a very tricky sphere, because unlike in refess falkows field is less allround, and have specialized units. Think about serpent: we have a super dmg dealer, we have tanks, a condition supporter/debuffer frog and an "increase synergy in file" synergy unit. Falkows field is the most diversly specified out of all spheres (thats why pinpoint in other spheres is anti falkow). So in falkow a tank has to tank and thats his main job.
Per se due to the differences in spheres, at least in 2 spheres the concept of "tank" doesnt make any sense at all. Of course there will be "tanky" units, but they dont need to have the role of a tank like in other spheres.
I absolutly agree that ex mermaid is fine as she is. But please dont argue it with "because other spheres should also get tanks like in refess", cause this argumetation is not exactly valid.