That makes sense. I have backup set of older regs with an attached Octo that I would always bring as well to save the dive if needed. It would of course have the proper BC hose for whatever I am running.From what I’ve read ( here mostly and elsewhere ) - some regs need specialised tools are more complicated to disassemble (Apeks for ex?) and the service technician at a remote vacation dive destination may not be equipped with the right set of tools to deal with any faults if the situation arises. Or he may be authorised or trained only for one brand if warranty is an issue.
But all this is only my theoretical knowledge.. I am just chatting away late into the night.
Hope others can help better