I feel the new trial/raids should be delayed before incorporated into Roulette

[Saccharin]

I just feel giving people time to learn and understand them before throwing them into roulette where it is like SURPRISE and you're forced to contend with it.

Roulette's functioning as it's intended to be. Your 'random' queue is to join duties that others need - and yes it's usually the new content.

If you dont want to join part runs uncheck partial runs (for now). It may take longer but no partial runs.