Yes some things are better in D&D5, but other things are better in D&D3.
What annoys me about D&D5 is for example the lack of feats you get. And there arent many choices either.
Or I also miss the delay operation that allows to group characters so they can work as a unit.
There is definitely room for further improvement.
In fact D&D5 some problems are still not solved, such as that warriors are more boring than spellcasters.
Neither D&D3 nor D&D5 really solve multiclassing of spellcasters well.
