A couple of days ago I logged in with the Jagex launcher (since I didn't have a choice), and no I hadn't migrated to Jagex Accounts, everything worked again... I have no idea what changed but all the issues I had been having over the last 3 months vanished. I no longer had to launch the client 5 times to get it to load, I could lobby and I could hop worlds. Maybe there was some bug that got patched, but all is good now.
I did try to sign up for the Jagex accounts on one account to see how it worked, but I never get the email to verify the email address, so I guess I'll just keep going with what is working for now.
21-Mar-2023 00:40:00