My thoughts, worries and proposals..
1) Raids in gw2 should get integrated into the game in a way that it will not affect the general game and how it has been developed and how it plays, that means be cautious about class balance and gw2 non trinity. I believe that the non trinity is great and fun, but it has pigeonholed the depth of tactics and communication that could exist otherwise.
2) Progression and Reward is a the reason people like raiding, the reason they get addicted to it. It should be linked with challenge and time investment but not exclude casuals and low skill players from playing the content.
My proposed solutions are according to the above..
1) introduce a new slot into the armour and weapons that we slot with gems which gives bonus active only inside the raid instances. Raiding needs an agro system. it produce better encounters with more variety and communication.
-Bunker/Tank gem -10% inc. dmg. +10% Inc heal + 10% agro generation
-dps gem +10%dmg -10% agro generation
-Support gem +10% heal -10% agro generation
Connect agro with highest toughness and damage done.
Have different agro templates for mobs, one target bunkers, one target squishes etc but let it be stable and always the same according to the template.
I believe you have already the technology to make those gems, using the whole day and night parameter, i think that you can create a new one only for the raid instances.
2) Defiance should be like it is or maybe a complete immunity. The suddenly when the raid boss does the big move that will wipe the raid make it so it will be removed so the raid group can interrupt that big move. That will produce communication about with the interrupts.
3) Increase the base attack speed of some mobs by a lot (don’t forget to decrease their damage) so they can’t be dodge tanked but make a dodge manta dory on their special attacks.
4) Increase toughness on the bosses and decrease their vitality, do so that it takes the same time to kill but will make conditions better.
5) Raid should be instanced and easily accessible. no pre quest, maybe guild unlocks.
6) Set max number (10?) and balanced around the max number but have a scaling if you can do it with less people. Balance around a certain composition of bunkers support and damage dealers.
7) Raids should need lvl80 exotic gear (which will only also have those gems i talked before) and reward ascendant gear. Unique skins and titles. Should have random reward for the joy of the moment but also a reward track like the pvp tracks.
8) Raids should have at least an entry difficulty for the casuals and low skill players and then increase for the hardcore and skilled players. I believe a system like fractals have with instabilities. Better raid level better and more reward maybe connect it with that legendary armor?
I think that my proposals don’t interfere with the rest of the game but they produce a complete new PVE “competitive” and rewarding state.
Thank you for reading this, and sorry for my bad english.