There has never, in the history of FFXI, been a single Endgame event that was equally accessible and beneficial to every job in the game at the same time. Are some events more accessible to Summoner than others? Definitely. For a long time, they were the ideal DD on Odin and things like ToAU HNMs before they were totally figured out. Does that mean we should be changing Abyssea for them just because they're not necessary? No way.

Also, 4k damage every 45 seconds is not the least bit impressive and pretty much every DD on the planet should be doing tons more damage. It only looks impressive because most pickup DDs are absolute trash, don't grab Cruor buffs, and don't even have Razed Ruins.