If anyone is "killing" the web, it is web developers using shitty frameworks and gimmicks on their i9 development machines, resulting in multi-second load times on 90+% of devices in use.
New recently introduced gimmicks only solve problems that were already solved. There is no reason that a site such as reddit should have to run scripts for 11s on page load, when a pretty much feature-identical site such as HN manages the same with 100ms of scripts running.
Modern webdev is, for the most part, creating new problems that didn't need to be solved. It's a job placement program, nothing more.
The really disheartening thing about this dichotomy is realizing that all of this extra effort, code, and time are in service of the banality of tracking and ads.