Two thoughts:

Fusefield requires some modicum of heal CD planning at min ilvl. Cannons to a lesser extent so.

Everything else is a borefest that can be solved without even planning your heal and mit oGCDs. And most of the checks are still mit checks.

Their encounter design team is quite obviously no longer designing for a trinity. They're designing for 8 players dancing through a script. Split into 2 groups of 4 called Team A and Team B that group together or pair up in different ways to solve mechanics.

Modern trinity survives not by the grace of tankbusters or heal checks but by the grace of light party stacks and pair stacks.