I think that is not giving 5e enough credit, there's a bit more than just "sprinkles" of 4e in the edition.
- Ritual casting allowing casts without spell slots.
- Internal Self Healing through hitdice (healing surges)
- Short Rest power recovery for many classes.
- Simplification of grappling using athletics (more similar to how 4e does it)
- Allowances for attacks utilizing non standard stats (cantrips using casting stat, hexblades using charisma on their attacks, etc)
- Action Surge maintained through the fighter class.
There's a lot of 4e in the dna of 5e.
says this is something of a soapbox for me, which I once gave a much more comprehensive analysis of. Can dig up a link but I'd be real surprised if you haven't seen it already. TL;DR on these:
- Rituals were generically available. Only a short list of Bard-specific rituals broke this rule. One feat, some money, and eight hours could let you learn your choice of 90% or more of the rituals in the game.
- Surges limit daily healing, provide large chunks of HP, and are reliable. HD are none of these. The two are in fact almost entirely opposed.
- "Many"? Really? Nah. 5e is mostly LR classes. Because almost all classes are neo-Vancian spellcasters. And 5.5e will be even more LR than it is now.*
- This is similar but like...grappling has always sucked before, such that no one liked the old way. To stick to that would have been objectively dumb, so changing it doesn't hold much merit in my eyes.
- ...making it class specific is not at all a similar structure. C'mon man, don't pretend like that's at all in keeping with the spirit of the original.
You also didn't mention cantrips, which are totally at-wills...that only benefit casters.
There's a lot of things in 5e that LOOK LIKE something from 4e. But it's almost always completely different under the skin, often literally serving diametrically opposite goals (the surge vs HD and at-wills vs cantrips examples are perhaps the most prominent here).
5e didn't have to be a perfect copy of 4e to keep the spirit of the rules it ported over. It did not actually do much of anything to keep the spirit of 4e's rules, even in places where it could have without much difficulty.
*The irony being that, if 5.5e does put everyone on the LR base, then it would actually become MORE like 4e, not less. Because then we could actually start getting some resource balancing going.