It's become harder to develop stupid simple bookmarklets because modern web pages are trickier to reverse-engineer, the market has expanded by a lot, and now people can make working on handy WebExtensions their full time job, and those are nothing more than bundled userscripts and bookmarklets that have access to some bonus APIs.
It used to be browser extensions were only used by a select few power users, if you don't count those installed by malware/shitware. Now it's common to see folks who only use their computers for Instagram and Youtube having all sorts of browser extensions installed intentionally, and use regularly. And they're essentially just bookmarklet/userscript bundles with access to some special extra APIs.
What's more, with the proliferation of Electron in desktop applications, now even more of the UIs we use are programmable.
It used to be browser extensions were only used by a select few power users, if you don't count those installed by malware/shitware. Now it's common to see folks who only use their computers for Instagram and Youtube having all sorts of browser extensions installed intentionally, and use regularly. And they're essentially just bookmarklet/userscript bundles with access to some special extra APIs.
What's more, with the proliferation of Electron in desktop applications, now even more of the UIs we use are programmable.