I can attest that the withdrawal fee is high but personally I'm still using the exchange because I never face any problem using it for years already. I also applied for KYC and got approve and all my transactions are smooth, the downside is only the fee, they just recently increase fees on some altcoins as well.
Well you are lucky that you are not one of the so many victims of HitBTC's account blocking policy. Just check out the ANN thread in exchanges board and see how many people are complaining with unresolved issues. When so many people complain about a service, then It means that there's something wrong with it
Each exchange does have its own issues even still unresolved and some complaints even into those famous exchange still having these kind of small issues.
If people do find out hassle for them then they can always make use of other exchange yet no one is forcing them to use the platform.Incase if there are
issues with fees then you can always make out conversions to alts to lessen up the fee.Not for erc20 at the moment because it is also high but there are
several coins which could really do the job well.
Of course all exchanges have issues, but the difference is that it's almost impossible to resolve them on HitBTC unlike other exchanges like Binance. HitBTC's withdrawal fees have been very high even before the bull market.