For one, it doesn't entirely matter what 1 single person wants in an MMO, or even 2, 5, 20, or 50 people, it matters what is best for the game and it's future and the population as a whole. Secondly, the content is absolutely pointless for anything but old school leveling to 99 for some jobs that might need that gear, and mythic creation. Since the former isn't really done by most people anymore (and the gear wasn't even that great), the event only serves purpose for those gaining ichor for a mythic, that's it... I'd call that pretty trivial.
So far, not a single argument has been valid enough to disregard cutting the time reduction. It doesn't matter that it can be done fine as is, it matters that it should be different for those who don't fit typical molds and they shouldn't be punished for it.
Long dead are the days of large groups, FFXI has been going more solo friendly for old and general content for awhile now, that won't change, but this should because it would allow more variation for players to be jobs that are "less then perfect to higher end players eyes". The point of working solo is to work for and from the angle of what best suits your abilities, jobs and equipment, not keep doing what everyone else says is best, that's what high tier battlefields are for if you want that.
Further adding to that, the time limit for party size was done specifically to combat exactly what the game is doing now: Prevent low man groups and force teams, partly for the sake of teaming up as a linkshell and encouraging large group dynamics and teamwork as was the norm at the time, and partly to prevent disappointment by low man groups from not being able to complete the content in time. Both reasons of which, are dead.
All other "old school" content allows 1 person to enter and complete. Dynamis, salvage, NNI, assault in general, this is about the only thing left that punishes those players and little valid reasons in this state of the game.
And since none of you against the idea have put together a sufficient reason why the timer should stay the same, except the same excuse given for groups which doesn't apply here or even support your point, there is even less valid reason to keep the time limits per party size as is. Except, if Dev's are planning to adjust Einherjer or create a new one under the same rule sets as a high tier battlefield, and can't make 2 separate rule sets.
I support the change.