Yeah the reason that at sea reloading hasn't been pursued and adopted at scale isn't because you're missing something that makes it not a useful capability. As you say it is very much a useful capability and if it were magically available with no issues then everybody would be lining up for it. The problem isn't that it's not a useful capability, the problem is technical. Essentially it's an engineering problem, it's just too difficult to actually manage the reloads quickly, reliably, and with low logistical footprint. This leads to it being a mostly unreliable boondoggle and not a capability you can trust in a high intensity war when you really need it.