It's not his fault.
This is fairly common.
My daughter was fine until a few years ago and she started to wet the bed. We talked to her Ped and started on meds. Worked for a couple of months. Her Ped wanted to up the dose and we opt not to. They will grow out of this but it takes time.
So we are cont. to do the same as you. Middle of the night wake ups, no drinking after a certain hour, pull-ups.
It's not her fault, she is a deep sleeper and her brain can't wake her up to tell her to go. she has weak bladder musles that when sleeping relax and let go.
We had to put a kabash on the teasing from her older siblings.
It's not their fault. Talk to your Ped.

We're in the same boat around here with our 6 year old. I wouldn't think of it as dropping the ball though. Yes it would be great if our son didn't need a pull-up, but I wet the bed myself until I was 8 or 9, and I've grown up just fine. I wish my Mom had put pull-ups on me!

I do worry the pull up gives him less incentive to even try, but then again, back to myself, having no pull-up didn't help either. I almost never woke up during the night, so it took a much more mature determination for me to flip that switch, as it were, and actually wake up when I needed to.

As my mom tells me now, it would be much more convenient for me if he did what I wanted, but that doesn't necessarily mean it is right to expect it of him. So we just make sure he goes before bed, and send him when he does wake up in the night. He's probably about 50/50 on waking up with a dry pull-up. I guess we've just decided to wait a while longer before forcing a change. (We also had a heck of a time with getting him potty-trained period. After an awful period of him resisting pooping at all costs which led to severe recurring constipation and trips to the ped, prescription medicine, and many nights of comforting a very pained child, we now consider ourselves lucky he only needs the pull-up at night.)

We had the same problem, she never leaves her room until after 7:30am for some reason, so we ended up getting her up in the night a couple times with the pull ups on and get her to go to the bathroom, even if she says she doesn't need to go, getting her up and sitting her down and trying. We found she doesn't have to go until after midnight, so we did about a 3am potty and that did the trick, but she still never gets up to go in the night. Now, she will just hold it until morning and go. No idea why.