Create an item that decrease the xp recieved

[UkcsAlias]

but I just tell them that being overleveled does not matter, because their real level is the level of the MSQ quest.

Yet that is only half of the story.

The reason overleveling is bad, is that other jobs at that point cant easily catch up to enable spreading the xp. And being lvl 100 in shadowbringers means you will lose a lot of xp from that point onward, unless you level another job far enough. This either means losing a lot of xp, or spending a lot of time leveling another job before the msq can take over.

Slowing the leveling and throwing away the xp is a bad idea to me though, as i think that this xp should at least be granted back through another route. Something as simple as just giving a static +20% xp on all other jobs means that eventualy the xp will be given out, while not being overleveled. Sure, it means the value has to be stored somewhere, but there are several other areas where this can help, as this then also means lvl 100 quests can now grant xp that help the lower level jobs. Lvl 90 quests now do give some xp, but at the end of EW you didnt get it. So technicaly everyone that completed the story then has lost quite some xp through it.

And overleveling has a serious negative effect on some fights. Especialy when you have those open world encounters, these dont scale up. So a lvl 83 enemy just gets 1 shotted, its a dull aspect of the msq because of that. Sure, these fights arent the most interesting, but its at least a fight. Even just traversing the zone towards the next area changes a lot when not overleveled, as random mobs can now be a hazard, and again force a few fights out of it.

Sure, its minimal things, but since we want to get a better msq experience, it does add up.

Also, in each expansion i was able to level 3 jobs at once easily, while just balancing the MSQ xp so jobs are at most 1 level overleveled. The msq xp is good for 2 jobs, while roulettes do allow a 3rd one to be leveled alongside it. Just using 1 job for the MSQ will result in a huge loss of xp gained (and if you use that same job for other activities, its even worse).

[Jeeqbit]

This either means losing a lot of xp, or spending a lot of time leveling another job before the msq can take over.

Slowing the leveling and throwing away the xp is a bad idea to me though, as i think that this xp should at least be granted back through another route.

This doesn't matter because experience is easy to get in this game. For example, you can go and do beast tribe quests and get a massive chunk of exp each day for 10 minutes of work (or less). Additionally, you are rewarded for this if you didn't fully rank the tribe yet.

And overleveling has a serious negative effect on some fights. Especialy when you have those open world encounters, these dont scale up. So a lvl 83 enemy just gets 1 shotted

Your level increases, but your gear does not. If you level without increasing your gear, you actually become weaker, because level dilutes stats. The only thing that makes up for this at all is new actions, abilities and potency increases, so it evens out enough.

Most fights take place in an instance, and due to this, the level gets synced anywhere. Therefore, it's not a problem in my opinion.

Also, in each expansion i was able to level 3 jobs at once easily

I can't relate to that because, for me personally, the exp is just enough. People who advise sprouts to level multiple jobs this way trap them when they have to find a way to level up the other job to the level of the MSQ and waste their time when they could be enjoying the story.