When comparing abilites with each other one has to be aware of the advantages of passives over actives. For example Constant Recovery is a passive while Exhalted Endurance is an active ability. A passive will stack with everything (won't get suppressed) while the robust regeneration may get supressed by other active healing effects. I'm only assuming this (did not test this case yet) - but given the general stacking rules of Deadfire this may happen. THat can be a reason why the bonuses of passives are generally lower than those of active abilities.
Also (in this case), the Robust inspiration will get removed by an appropriate affliction. Constant Recovery will not get cancelled by anything.
That's a valid point, but I'm still not convinced. Constant Recovery and Ancient Memory where both nerfed in PoE from being unlimited to a limited time. Now Ancient Memory is unlimited again in the shape of a chant and, according to the tool tip, heals more than Constant Recovery distributed over the whole party (my Constant Recovery is stated to heal 6 hp/3s while Ancient Memory states 1 hp / 1s - that comes to 3hp/s vs 5hp/s when seen from the party's perspective). I don't follow the logic of Ancient Memory being fine unlimited while Constant Recovery is still limited.
Weapon & Shield Style gives you +6 deflection (and even more reflex) while it forces you to wear a shield (loosing dps) - while Superior Deflection stacks with it and has no drawbacks. But I agree that +4 is laughable. Why nerf it from 5 to 4 in the first place? It's like somebody said "Whooha look at that! +5? Let's stomp this overpowered thingy down to 4, that will balance things out a bit and teach it a lesson, show it some modesty!".
That's certainly one way to look at it, but you can also consider how much stats are added in total. Weapon & Shield style is available from lvl 1 and grants you +6 Deflection and Shield bonus to Reflex, which amounts to at least +10 Reflex depending on shield, resulting in at least +16. The tool tip doesn't properly explain the workings of Deep Faith, but I guess regardless of dispositions, you get at least +2 to every defense, which amounts to at least +8, more likely +12.
Superior Deflection on the other hand comes much later, grants only +4 and has a much greater competition (like the affliction resistances and other stuff).
My idea of balancing is that passives that are available later should grant more useful bonuses, and that regardless of multiclass combination, there should always be a proper incentive to pick one passive over the other. I think this is simply not the case for superior deflection; the argument to take it should definitely not be that it still stacks with the others after you got them first (which is the case once you decide on using a shield, and that's bad design in my opinion).
IMHO, Weapon and Shield Style should only confer the shield bonus to reflex, and superior deflection should be a lvl1 fighter ability and buffed in order to compete with Deep Faith, so that a Crusader has an actual choice between the two.
In general, I don't like the overlap of the passives at all, since they only serve to blur their purpose. The increase in movement speed of all classes versus the one from the monk is another example for this.
I'm all for passives, but balance them properly against each other when they have overlap or make them disjoint.