We should follow exactly what the training agencies specify for our gear. There is no room for personal responsibility and/or thinking independently.
Of course when an agency says that 10 yr olds can get certified, we obviously MUST accept their expert thinking.
Of course when the training agencies allow Air -2's, then we MUST accept that as safe option, regardless of our own opinions.
And don't forget that an octopus regulator is NOT required or necessary, unless of course the training agencies change their collective minds and subsequently require it for all dives.
Shall I also mention the change with respect to power inflators on BC's, or shall we go back to the ever popular requirement that snorkels are necessary, yet many people just seem to "know better". How about solo diving? That was proscribed as best I know for a long time, but now it is OK if you buy the right course and take the right gear.
Follow the directives of the agencies and don't think for yourself. Just trust them, they know better about your diving.
And while I am at it, that cross chest configuration looks way cluttered to me, I think I would prefer a slung position or back mounted.