Why?

[Squintina]

If you can't get adequate credit on an on-level FATE solo with your bird out, you need to take a good long hard look at your gear and rotation. The only FATEs where you really can't solo them on your own are the boss FATEs and even then we're talking most likely the achievement ones that weren't meant to be cleared by solo players in the first place.

I hope that's a general "you" and not actually aimed specifically at me. I just party up.

I only mentioned that because that is something I have seen in boss fates and hunts where someone WANTS to party with nearby players but can't because of a queue. In other words those players aren't trying to solo group content, they solo in the sense that they don't join a party but they do have other players nearby, they simply do not join the party because to do so would mean losing their place in the queue. Because of that they might not get as many rewards. (and I also said most such players accept that fact no problem, but that I'm sure they would like if SE ever decided to come up with a different system in which they ranked better)

Also this thread was kind of aimed at boss fates since the OP mentioned Ixion (and then people went into hunts because the crediting system is so similar), so not sure why you felt the need to mention regular fates. Pretty much anyone can solo (actual solo) regular fates as long as they know their rotation and have appropriate gear , but that wasn't the topic AT ALL.

Just to clarify I do not think adjustments are necessary, they would just be a "nice to have", a QOL (in my mind). I'm quite content with the existing system but that doesn't mean I don't have the ability to empathize with others and see merits to their opinions.

After all, I also wrote earlier:

Well you asked "why" and you were answered. Whether it's a good system or not, well that's subjective.

Personally I find that even without asking for an invite there are usually PF up you can join without asking, or you can make one and incoming people will join it, so it's not really a big deal (and because of that I doubt the devs will spend the effort needed to fix something that can be so easily circumvented, regardless of whether it's good or not, especially when there isn't a general concensus that it's bad.)

Doing full tank enmity (or doing 1 hit as a healer and then going full heal spam) is one way to get full or near-full credit solo, though it's not guaranteed.