That said, I must acknowledge that my KYC experience with other exchanges like Coinbase and Deribit was much smoother, with their teams actually communicating throughout the process. Unfortunately, the OKX team has been a complete disappointment.
The thing with centralized exchanges is that for the ones you think were smooth for you, there are a 100 or more people out there who think the exchange team was a disappointment to them at one point or the other. Cex can be frustrating, irrespective of the one used sometimes.