My adjustable packs to get changed if someone else with a longer/shorter borrows them. Roos and I have variously used our two Macpacs and adjust the harness according to which of us is using it.
But if it's just for you and you have one that fits there is nothing to gain from an adjustable back. In fact you have something to lose, because you are paying for unnecessary complexity, and therefore extra weight.
Well even adjustable packs can certainly not fit You want to check anything really.
Certainly agree about not wanting so much back system though - even a framless pack should do 4-6kg entirely comfortably, and you don't especially want your pack being 25%+ of your net load.
Might be worth double checking the load range though, as water say can easily be 2kg for a full day.
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