So Kuzenbo's Shell Spikes seems like a disengage tool, which is weird for a Guardian which is clearly meant to engage and disrupt. So, when thinking about how Kuzenbo could benefit from a different kind of ability besides Shell Spikes' damage reflect (which always felt kind of gimmicky to me anyway) I thought about what could be useful, especially in this meta.
I present, Shell Armour:
Kuzenbo reinforces his shell, gaining increased damage mitigation and immunity to critical strikes for 5s. While active, each time Kuzenbo takes damage, the cooldown on NeNe Kappa is reduced. Kuzenbo is also knock up and knock back immune and disruptions do not decrease his passive meter for the duration of this ability.
Self Damage Mitigation: 3/6/9/12/15%
Cooldown Per Hit: .2/.3/.4/.5/.6s
Ability Type: Buff
Cooldown: 14/13.5/13/12.5/12 seconds
Cost: 50/55/60/65/70 Mana
With Shell Armour instead of Shell Spikes, Kuzenbo can gain an increased frontline presence and still get the cooldown reduction on NeNe Kappa without forcing enemies to disengage from him because of the damage reflect on Shell Spikes.
With Shell Armour's immunity to critical strikes and knockup/knockback effects, Kuzenbo could then be a viable counterpick to certain teamcomps with a large amount of knockup/knockbacks and the general crit meta for hunters. This was just a shower-thought kind of idea, since Kuzenbo seems like he has a lot of potential, just that Shell Spikes seemed like an oddly gimmicky ability without much real utility outside of Thorns+Shell Spikes cheese strats.