Problem with other average gambler or small time gamblers they are over exaggerated on things which is manageable with. Besides if they are playing on reputable casino then there's really no problem with this, maybe we can only got an issue if a new casino will ask this requirements and hold our withdrawal for questionable reason then maybe for that we might gonna face more trouble with them.
Whenever you sign up for any new casino you should always do extensive research about it like read reviews from different sources and also have a look on their T&C while you register over there through which you will come to know about KYC but with small amounts you can start playing to check for any issues.
Usually a reputable casino will not hold your earnings for questionable reasons, since all reputable casinos have very clear terms for KYC and other rules. If you obey this rules then there is no problem. For example if you look at the threads where they talk about payout issues, it is most of the time an issue that the person themselves caused. Usually the issue then takes some time to be resolved, but if you cause the issue yourself then it should only be fair to give some time.