> while eventually tapering and getting them off the glp entirely as the final end goal

It's an honourable goal but the evidence isn't great for that

> You still have to improve diet and regularly exercise anyhow

You don't have to. Should though.

When the drugs are working as intended, you'll lose weight without 'trying' to improve your diet, exercise will speed up the weight loss, but isn't strictly necessary for it to "work". Encouraged, sure, but you'll get weight loss from the appetite suppression alone.

The 'high protein' advice is because a lot of glp1 consumers had poor diets to begin with, and they're catabolic drugs. Combine that with reduced appetite and you're at risk of insufficient protein consumption to maintain whatever muscle mass you started with.