I gradually went from 17” to 15” to 13” laptops for my personal machines.
The main thing I miss is the expansive keyboards on the bigger machines. The 17” ones even had a number pad, and some my 15” ones did too.
My current work laptop is a 15” Thinkpad P15 Gen2 with an i9-11950H, 64gb of ram, and an rtx 3080 mobile. It’s a beast but very reasonably sized for its specs. It’s a little bit chunky but I wouldn’t expect anything less with a high performance cpu and gpa. Lots of ports, 15” OLED display. I love it, even if the battery life is abysmal. It’s a workstation.
But my personal machine needs to be small enough to throw in a bag and not think about, so its a Ryzen powered thinkpad X13. The screen is a little dim and the battery life is way worse than a comparable dell XPS 13, but it was inexpensive and does everything I need. The major downside to the size is the keyboard is also shrunk, so lots of typing sucks.
The biggest problem with both machines, and its true of all thinkpads, is that Lenovo put the function button on the leftmost of the lowest row instead of ctrl button and I often try to copy paste and accidentally hit the function key instead of control. I ended up getting a mouse with some extra buttons and I’ve assigned one of them as ctrl instead, but it would be better if the ctrl button would just be where it was supposed to be.