Sorry about the misunderstanding on versions, you are right about how we look at the full version number, but when upgrading from PS 5.5->5.6->5.7 due to the amount of changes we consider those to be major upgrades and upgrades from eg. 5.6.30->5.6.31 (smaller upgrades in the same series) only minor upgrades. I hope it makes sense.
Sorry about the misunderstanding on versions, you are right about how we look at the full version number, but when upgrading from PS 5.5->5.6->5.7 due to the amount of changes we consider those to be major upgrades and upgrades from eg. 5.6.30->5.6.31 (smaller upgrades in the same series) only minor upgrades. I hope it makes sense.