On a live-aboard, you don't need to change out tanks or reassemble your gear. Don't you use a fill whip? I don't mind a crew member analyzing my gas, as long as I am witnessing it.
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It takes me 2min max to change my BP over from one tank to the other. What fine meal did I miss in those 2 min? ;-)Changing out tanks, reassembling gear and analyzing nitrox for guests is not commonplace in the rest of industry?!?
If you are on holiday shouldn't you be pampered? If you are too busy taking care of this yourself you don't have time to enjoy your surface interval. Between dives you should be able to relax, eat a fine meal, go for a swim or snorkel, take an excursion (did I mention eat a fine meal?), read a good book, work on your photos and spend time with loved ones or making new friends.
"sure, switch to a BP/W early in your career - but starting with one on your first 20-40 dives could be detrimental"