Earlier quoted context omitted.
It’s worth remembering that Flash was in fact extremely successful. I think we’d still be using it today if not for some combination of (1) Steve Jobs and (2) Adobe mismanagement. People say Flash was bloated but try running Slack on 2008-era hardware and let me know how it goes. And there’s no reason Flash couldn’t have been adapted to use responsive breakpoints and such for mobile friendliness.
Slack and other ill-optimized Electron apps are not great, but Flash was far worse, at least in my experience. With Flash a single banner ad in some tab you forgot you had open could consume half or more of your G4/G5/C2D, whipping your fans into a frenzy and roasting your lap (if using a laptop). Slack, etc are a detriment in terms of heat and battery life too, but not to such an extreme extent and at least you're g…
And not coincidentally, html5 banner ads will do the same thing on a G4/G5 today in TenFourFox, if you disable the built-in adblocker.
Which is to day, I actually think modern websites are much heavier. What changed is the hardware.