Don't forget about all the embedded UIs (kiosks, appliances, car infotainment, industrial equipment, ...), those computers are weaker and it makes a ton of sense to use native toolkits there.

They tried to replace our Qt GUI at work in this space with a react based one, the new UI ran like utter shit comparatively, even after a lot of effort was spent on optimisation.

Also, most of the world don't use high end developer laptops. Most of the world is the developing world, where phone apps on low end Android phones reign supreme.