There are vast untapped markets that are being totally ignored. As in, you can't vote with your wallet because there's literally nowhere to put your money.
Very few laptop manufacturers allow key customisation (e.g.: using laser engraving). None allow a choice of keyboard (e.g.: with or without a keypad, with or without dedicated ins/del/home/end/pgup/pgdn keys, separate arrow keys, [fn] button left or right of [ctrl] etc...)
Nobody makes laptops with really good HDR screens and HDMI inputs capable of RAW recording. There's production crews out that there that will happily drop north of $10K for something like that.
Similarly, there's only a handful of laptops with non-key inputs, such as shuttle/jog wheels and the like.
I don't think anyone on the planet makes OLED 4K screens in the 16 to 20 inch range. They're just not made, for any purpose, let alone laptops.
I've never seen a 17 inch or larger laptop with a narrow bezel. They all seem to add an extra inch on both sides just to waste precious space.
There are telco engineers out there who would appreciate a laptop with a built-in QSFP+ connector. In general, laptops with > 1 Gbps wired network connections are very rare or borderline non-existent.
Very few laptops have built in GPS, although this is slowly becoming more common.
I bet there's a lot of field engineers (think oil exploration, forestry work, etc...) who would appreciate a large, capable laptop that's semi ruggedized. As in, not a shoebox with bumper bars designed to hammer nails in, but merely rainproof. Think cooling fans but with the fans outside a sealed electronics compartment so the water isn't sucked in.
I'd like to see internal power-supply as an option to replace the battery. Alternatively, the option to switch between two batteries or one battery plus integrated PSU.
I'd like to see high-wattage PSUs optimised for weight instead of cost. My 130W PSU is a literal brick in size, shape, and weight. It doesn't have to be, and Apple has demonstrated that this is possible, albeit at a slightly higher cost.
Again... the race to the bottom is fine if selling laptops for Moms and Dads that need to buy their kid something for school, but it's not okay for the high-end that professionals are looking for.