I agree with that. I've found that the number of house rules I have made to get it to fit my vision of how D&D should be is a lot less than for any other edition. And the way the game is designed it is also a lot easier to make those rules.
So, yeah, if he wants to there are a lot of things he can do with it to make it closer to 3.5. I was just judging by the fact that his dissatisfaction seemed to stem from it differing from a favorite edition that he seems strongly attached to. In my experience, those least likely to want to adopt 5e are those most in love with a particular system. I've called them "Pathfounders", because they've found the edition they like (and Pathfinder is only one of those), rather than are currently playing with the game they like more. It isn't intended to be derogatory.
If I had my way, I'd get everyone to try out 5e for a good long adventure at least, play with the variants and options that appeal, and then see how they feel about it. But then again, if a 6e does come out in another 10-15 years (and I'm not convinced that it will), it's quite likely that I'd be a 5e Pathfounder who wouldn't want to really try it.
I think 5e is a lot easier of a sell to to roleplayers and fans of D&D than most editions that players switched to with the exception of perhaps the 1st to 2nd edition period as 2nd edition was largely just seen a continuation of what people were already doing.
But like 2nd to 3rd edition was painful, 3rd to 3.5 was excruciating as there was so much resentment towards Wizards of the Coast at the time, in fact I ended up having to buy player handbooks for people just to get them to even have a conversation about switching. 3rd to 4th edition ... well everyone knows that bit of history but that was the single worse time for D&D, I couldn't pay people to show up to a 4e game.
5th edition though, its been super easy to get people to try it and the large majority have adopted it. I honestly think its in large part due to the fact that its very easy to convert material. 1st, 2nd, 3rd, 3.5 and Pathfinder material are so easy to convert that you can almost do it on the fly (I know I do). And no one plays 4th edition so I have never had to convert anyone from it.
Pathfinder players though are hard to sell 5e on but I think its because Pathfinder has such an emense library of amazing content that is tailor made for the system that for DM's and players its so easy to continue using it. Though Pathfinder material can almost be used as is in 5th edition so there is great compatibility there. But yeah, Pathfinder players are the toughest, this is a very happy group of RPGers that really has no reason to switch, they have a great system and the love it. I don't blame them for not having any interest in 5e.