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In the time I've spent diving (admittedly, much less than most on here) I've seen precisely zero divers who were diving with more than one tank at a time, and zero rebreathers. I'd wager money that the overwhelmingly majority of all people who get certified to dive never progress to doubles or a rebreather. That some of the most passionate divers eventually progress on to tech diving doesn't mean that "the vast majority of divers" have a need for any such thing. I've dived to recreational limits and didn't surface thinking "darn, wish I'd had a second tank with me".
Of course, a diver who never advances beyond DSD or OWD, won't need the extra gas
In my experience, the majority of those who progress, end up on a different solution than jacket style BCD and single tank.
Scaling Hogarthian OC:
0 - 100 ft: use a single AL80
100 - 150 ft: convert AL80 to Nitrox50 bottle + doubles
150 - 200: add AL40 oxygen + Nitrox50 bottle + doubles
200+: add another AL80 bottom stage + AL80 Nitrox50 + AL40 O2 + doubles
Makes sense.
Most of the divers I see, start out on a 12L or 15L steel tank, which is of course less recyclable than the AL80 later on (unless building a 12L into a doubles set by adding another and a manifold).
Of most I've seen progress to technical courses, the majority usually go for an AL40 as their first deco bottle, but I like the way you've recycled really well through the progression.
Another option:
0-60ft: 1x AL80
60-100ft: 2x AL80
100-150ft: 2x AL80 + 1x AL40
150-200ft: 3x AL80 + 1x AL40
200+: 4x AL80 + 1x AL40
Don't you have steel over there in Scandinavia? Why oh why would you use stages of backgas plus al80 doubles for a those 130ft+ dives (unless you are someplace without them)