SE has failed to fix this since launch

[Ultimatecalibur]

You get your t2 combo attack, which is identical to the one you can cross-class from the other tank, at level 4, before you even have access to CC abilities. There is no point in *ever* taking SS or SB as CC abilities as a MRD or GLA because you get something that will do the *exact* same thing for the *exact* same cost *without* taking up a CC slot 6 levels before you even have access to CC abilities.

First crossclass slot opens at level 1 or 5 (can't remember which) and the second a 10.
FB->SB->SS and HS->SS->SB are 150 potency/350 enmity for ~63.333 TP per gcd vs FB-SB and HS->SS 175 potency/375 for 65TP per gcd. This is similar to the difference between a LNC using TT->VT (175 potency for 65 TP per gcd) and spamming Impulse Drive (180 potency for 70 TP per gcd). It's a slight TP advantage at the cost of damage/enmity generation and there are exceedingly few fights where it would have a noticeable effect, but the effect still exists. The reason exists but it is far from a great reason.