catherine96821:I think it is perfectly reasonable to ask.
I do too, but the answer will always be, "no." That's automatic, because if they had the confidence necessary, they wouldn't be asking. The mere question tells me they aren't ready. A different question might be, "I've been diving solo for quite some time. My usual proceedure is ________. Do you see anything I could do to improve?"
catherine96821:And the answer should be something like "when you have several hundred dives" at least. I had a thousand.
By the time I had 1000 dives, almost 300 of them were solo. Of course, my situation was different as most of those dives took place while working as a DM on a charter boat.
catherine96821:People know when they are ready, but often they ask before they are ready
Yes, they do and they don't ask. Those who do ask are never ready.
catherine96821:Although basically what happens when you solo, is that everyone advises you not to, and you do it anyway.
Actually, I've never had a diver (except my original instructor) advise me not to dive solo. I have had lots of non-divers tell me not to solo.