III vs XL+: Please give me your advice.

[Clockwork Creep]

Nope. In that case, I’m buying a different unit with enhanced capabilities. And I never have to buy anything. If I didn’t spend another dime, I’d still have the same Axe-fx II that I had yesterday.

That was the whole point of the "Buy it more than once" conversation. Upgrading, constantly.
The flute, you just have it. It's done. Nothing to look forward to, no incoming future upgrades.

 

[Rex]

The flute, you just have it. It's done. Nothing to look forward to, no incoming future upgrades.

Unless you have a $3000 flute and want to upgrade to that $9,000 one that you've had your eye on for a few years. Or that 60-year-old, one-in-a-million flute with the unique voice and a perfect embouchure that just feels right; the one that'll set you back $85,000 — the price of forty Axe-Fx XL+'s.

The point is, neither the flutist nor the guitarist needs those upgrades, although each might desperately want them.