that's why for op seeking out exchangers would be a tough job testing out each one of them but rest assured delays would be surely experience along the way.
I take your point that it's a difficulty across the board given the current interest levels in crypto. That said, I still have to get an account opened with whatever's closest right now to a functional exchange that will offer a competitive rate (as I intend to take 'some' profit from my current holding).
Whilst all exchanges are under pressure, I would imagine some are performing better than others. If I take the Kraken example, if they can't even answer my query ref. address change, I simply cant use the account ( i cant cash out until change of address has been effected - for tax and other reasons).
I can put up with delays (if i have to) - but beyond that - I still need a functional exchange to cash out some of my btc holding to FIAT competitively.