Summoners as a tanking class

[Anova]

As mentioned for the reasons above, I just don't see how the Egi can be a viable tank without a complete rework of the pet mechanic or the summoner job.

Pets are never going to be as powerful as a paladin, warrior, or dark knight. And I don't see how many people would like the thought of turning Summoner from a caster to a tank. People already complain enough that SMN only has 1 nuke and pets instead of traditional FF summon spells. You will have riots if you change the Abilities and stats of Summoner from a caster to a tank ; or even worse responses, make SMN the only job that fills 2 roles at the same time (SMN would probably beat WAR in terms of combining tankiness and dps potential if SMN dps is kept as is and made a viable tank).

I think tanking with Egi is something people do as an emergency measure. It is sub-optimal, but it beats sitting in a dungeon waiting for a tank. I'm not saying you shouldn't do it, but there's a difference between an improvised party tactic and intentional gameplay design. A healer could tank simply by having enough VIT Accessories and heal spamming, but that doesn't necessarily mean it's a good way to design a party.

Adding tanking viability to the Egi will break the Trinity and this will have to be done for every other job/class as well. Some classes obviously already push boundaries, but it can still be considered power creep at the moment.

Nobody is consciously destroying the Trinity as your suggestion would do. If that is your intention, that's fine. Just plainly state that is how you want to play. Otherwise, we applaud your work and your diss of the tank in your party.