Hear me out:
The only, absolutely only reason why people don’t generally marry on the first date is to figure out whether they DON’T fit together.
So if you manage to figure out that the relationship is not going to work out before you get into real commitments (kids, mortgage, …) you successfully avoided trouble.
I see it so often that people think that dating is already a strong commitment and that ending a dead-end relationship is a failure.
There is no shame in realizing the relationship is going nowhere and ending it.
For the point of the argument it doesn’t really matter if the goal is marriage or some other type of long-term relationship.
And if you are going with a low-commitment casual relationship (which is totally fine, of course, no judgement here), then you do that because you don’t exactly expect the relationship to last to the grave. In which case not ending a non-functional relationship purely out of feelings of obligation, commitment or shame should be even less appropriate.
I mean, isn’t the point of low-commitment relationships to have low commitment? If the relationship sours, why feel shame for ending it?