Nebulous
Legend
Really, 5E is something of a unification of what came before. There are a few new mechanics (advantage) and flatter math, but it's mostly pulling together the most functional elements of all the prior editions and filing the edges until they fit together.
That is why your friend sees 3.5 in 5E -- it's in there. Honestly, I see more of 1E, but that's what I'm looking for. When 3E and 4E were released, one of the big conversation topics was whether they "felt like D&D". I have yet to hear anyone ask that of 5E. Even to people who want to continue with an earlier edition, there's really no question that this is D&D. The conversation is around the same sort of things as if this was an errata or x.5 edition. And that, right there, means that Wizards did right. It's not going to be perfect, but it's a keeper.
And that is what they claimed they were shooting for from the beginning.
I really had my doubts, it was an ambitious goal, but judging from what i see in the
Basic rules, i really think they did it. And on a group by group basis, a few sprinkled
house rules and you've got *exactly* the kind of game you want. It's not perfect, but
I see so much that i like....love.