Some tools were certainly better, like Flash. Mobile made a lot of things complicated. Half the game dev tools still don't run properly for mobile. HTML5 was supposed to make things easier, and for a while it did, but it got rapidly more complicated afterwards.

Some things are much better today, like Procreate.

I dont think HTML5 was supposed to make things easier. It is just that major players wanted to get rid of flash for own reason (some of them valid) and HTML5 was something they were able to point at. It was never easier or even half replacement, it was significantly more complicated and crappier experience for an average normal creator.

It never even got some convincing demo. All those I have seen at the time were the "spend a lot more time to produce something much less impressive" kind of anti demos.