Please consider option to exclude unlocked (not yet completed) contents from Roulette

[LazuliteKouha]

I'm a bit confused, how does not doing sidequest/optional content considered abuse?
If I didn't do any sidequest/optional content, shouldn't that "punish" me instead?
I'll have less content on my roulette pool, thus longer queue time for me.

If given an option to exclude any duty from a roulette for any reason, some people will use it to avoid doing a duty ever.

I would like to emphasize that I didn't mean the option to pick what duties to exclude from the roulette, just the option to exclude not yet completed duties.
I'm assuming if people unlock any optional duty, they plan to complete it.
If I didn't care about a certain optional duty/content, I wouldn't even touch the NPC.
(I personally haven't found any situation/reason where I'd unlock an optional content but don't want to complete it, if there's any that people actually do, please let me know)

In my opinion, putting not yet completed duties inside roulette pool doesn't really make sense.
If someone want to complete a duty that they've unlocked (but not yet completed), they'd queue that particular duty directly anyway.
And the roulette is there to incentivize people to "help" them.

If anything, the current roulette requirements are already too lax--people can unlock just MSQ-required dungeons and never have to run any others in their roulette. The roulette should require unlocking all duties up to your current job's level so that people can't tailor their roulettes to a specific duty set.

I assume you mean the roulette should require unlocking all duties, including optional ones.
So, only people who unlock everything can access the roulette? How is this any good for the game?
I understand if your point of view is "roulette is to incentivize people to login daily" etc., but roulette is also there to incentivize people to "help" others who want to complete their duty with matchmaking.
If you make it so that only those who unlocked all duties can use the roulette, you'll reduce the amount of people they can matchmake with, longer queue time for them, and for you too cause there'll be less people who can use said roulette.

people who want to save certain duties for certain friends can already do so by simply not running their roulette until they've run the certain duty with the certain friends.

I knew this is coming.. I could also think of a 'simply...' solution for what you think is an abuse of the roulette system, but it'll most likely just goes back and forth and turn nasty, so I'll stop there.

[Adeacia]

(I personally haven't found any situation/reason where I'd unlock an optional content but don't want to complete it, if there's any that people actually do, please let me know)

I do that all the time. I unlock the savage and extreme content when it becomes available but never actually run it. Not sure I ever will either. Why do I unlock it then? Because I can. I try to unlock all the games content, even if I never end up running it.