With the Steam Deck nowadays there is not much need for a gaming laptop unless you want to play the few games it can't run. Though even integrated GPU's in the more recent laptops nowadays are good enough for running games (usually at low/medium settings, 1080p)
Not a few. You are overestimating steam deck. I have one. It's for small games. And I'm not talking just about AAA or not. Steam deck is pretty weak.
Laptops with the newer nvidia generations that support framegen make this a harder argument. Yes, laptops are always severely power and thermal constrained, but you can run raytraced games at 1440p 240hz on them now. HL2 RTX at that fidelity is a trip. The concept of a high end gaming laptop is a pretty big market, but not when the mfgs and firmware devs can't manage to prevent stuttering that most of their target market would notice and find unacceptable.