and honestly the 3 minute recast on Sentinel was so unjustified, and there was never an answer to the extra 60 seconds wait, for all of 10% extra compared to the others. Usually you would hope rampart was off cooldown and can pair sheltron, even then that was never enough, example being the first Homing Laser at the start of ultima in uwu where you would need apoc also, or if you got cucked in o10s on the debuffs in the latter phase.
Speaking of Bulwark, it was only really worth using on trash packs or for fluff damage like autos, relying on an RNG dependent cool down is just terrible for tankbusters, the skill itself was awful for a 3 minute recast. There is nothing wrong with the current 30% DR skills, there's no need to tamper or tweak with them, they're used to mitigate damage, trying to put fancy bells and ribbons on them is a pointless endeavor.