Ability to increase spirit for any class on passive tree

Spirit is extremely limited if you want to play summoner. Jonathan said there would be no clear necromancer specialization, but I’d argue this actually is the case in PoE2 because the infernalist ascendancy has Beidat’s Will:
Reserves 25% of Life
+1 to Maximum Spirit per 25 Maximum Life

My suggestion is to put this on the passive tree as a keystone node instead, since anything that increases spirit is practically mandatory for a summoner.

With this node on the passive tree, infernalist is still a top pick because it can overflow life, which can give it more spirit and thus more minions, however that is then an active ability with downsides and thus not an obvious pick. Rather, you could also be a Titan that has a 15% extra life node which would perhaps give enough extra spirit for another skeleton.

Additionally, it feels odd that there is no spirit nodes on the passive tree, and only 1 spirit reservation efficiency node (which only applies to minion reservation). I’d have expected 2 or 3 of these nodes.

Thanks in advance for the consideration.

Ps. This is all in addition to that I think there’s a need for more gear options that offer spirit, including melee/ranged weapons, offhands and jewelry.