Not sure I understand. Metric or imperial make no difference. It's desirable to have the reserve in a form that's sharable, sustainable, and streamlined. Reserve distributed across several stages just isn't. This thread may be of interest.
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As an aside, once you memorize the imperial tank factor, it's as easy as metric.the maths for reserving gas works out far easier in metric
Going from pressure to volume and vice versa is easier in metric, however with both metric and imperial tanks you will still need to gas match which gets more complicated when tank sizes are dissimilar.Thanks, the thread and others have been read with interest.
Styring gas in backgas is of course the same between imperial and metric, I just argue that, at least to me, the maths for reserving gas works out far easier in metric.
"memorize the imperial tank factor" ==> NOT "as easy as metric."As an aside, once you memorize the imperial tank factor, it's as easy as metric.