While new Intel cpu's are faster, they are not that much faster. Single threading performance between say a 4th generation
Intel® Core™ i7-4910MQ and an equivalent clock speed 11th generation is not that much faster, on the order of maybe 30%. What the newer Intel (and AMD) cpu's have going for them is multi-threaded performance, as they often double the amount of cores.
Regardless, a high-end, expandable older laptop like a Dell M4800 or M6800 with a 4th generation 4-core 8 thread CPU, 32GB of memory, and SSD will be a fast system for all but the most intensive tasks. And the bonus is that it's cheap, the docking stations are cheap. $400 versus $1200 or more.
Newer Dell precision laptops are not nearly as well built and are not nearly as expandable. I used to buy top of the line stuff in the past, but began realizing that I was wasting money. Over the past few years, I've purchased of Ebay: 2 Dell M4800's, a M6700, and a M4700. I also own 3 Dell XPS 13 convertible laptop/tablets (one I bought used). Still running 2 older i5-2500 systems, and two AMD Phenom X4 II systems.
I did break down and upgrade the MB and CPU on my tower workstation to a Z590 MB with an Intel i5-11500, with 32GB of memory, for around $600 total price. Upgrading a desktop is far more affordable than a laptop, and it's nice having 12 cores, versus 4. But getting something like this in a laptop is far more expensive.