Wouldn’t you want space under the bench to sit?
Not really to be honest. I have always been happy to stand, and that also allows for more storage space underneath. Personal preference I suppose.
What job does it need to do?
If the worktop flexed when leant on, or was easily chipped from things being generally bashed about on, then I’d say it’s not up to the job as it wouldn’t be long lasting.
As I said in the OP, my concern is that it looks rather thin and flimsy (but someone may well confirm that it’s sturdy) – therefore better, harder wearing options can be found elsewhere for the same/less outlay.
First rule of a mancave, make your own.
Definitely considered this. Over engineer it. Stand back, admire it, drink beer…