I have two thoughts on this.
Back in the day, when I was young, carefree, and had the time, I did the 1e. And boy, did that take a while. But because I had the time, and my peers had the time, that was fine. Getting to the extreme high levels was both fun and a challenge. But we couldn't do that now.
Now, with 5e, we are getting to the high levels way more quickly. Which is also fun, and a challenge, and *manageable given my schedule.* It's just built differently.
More basically, it's engineered to advance PCs faster, and allow for more infrequent play (IMO) while keeping interest. I would say it has succeeded.