Most clients using client side rendering which uses an awful amount of bandwidth and performs bad compared to VNC/RDP is not my idea of 'fine'.
Especially not if it's used to justify opposing a better solution.
For distant remote access with particularly animated or graphically detailed applications, perhaps. Though I'd not argue VNC as being lower bandwidth except where you've got it tuned to massively compress to the point where things that are bad through X are bad in different ways through VNC. RDP usually does better in this respect, as do some less common protocols.