Wayland vs. X11 Comparisons
dedoimedo.com
dedoimedo.com
I am quite sure no developer out there uses a lowly 2019 laptop for their work. Most probably have 32-core top-of-the-line systems
There are many many casual developers.
And running a current operating system on old hardware is a very common reason for choosing Linux. And broken shit that used to work is a far more critical metric in the real world that anything measured for the article.
So less resources available for other programs. An improuvment.