A laptop is a distinct tool from a desktop and if you try to use it like a desktop, I agree it is a terrible substitute. Personally I find laptops vastly more ergonomic than a desktop, but I never program with my feet on the ground.
I've found my smartphone's the best device for that. I wrote an entire programming language using my phone.
Been trying to make a handheld cyberdeck to replace the phone with something better, but it's still a long way from being real.
Set up wireguard in my router and now I've got remote access into my LAN. My laptop has essentially become a Linux server. I just ssh in from the phone and write code. Can also easily launch and use codex.