I do believe it's the shooter. But I also believe a bow that fits you well, that you can master your form and control with, will shoot best for you regardless of which it is as long as you stay in your effective range.
I've been struggling with some shoulder pain for a while and with a very busy work schedule, fatigued muscles and sore everything I've really limited my shooting. For a while it was only 3 shots once a week, sometimes once every two weeks. Went three weeks once in June. I'm up to a couple of times a week but normally no more than 3 arrows. Focused, don't release unless it's right arrows. Staying at 13 to 15 yards. And it has been effective to keep me at least in a place where I could make an effective kill shot if I could actually get a chance to go hunt some pigs.😒
I've never held a bow that shot as well for me as this Primal Tech. Every time I pick it up I feel like I'm going to hit the spot. More often than not I'm PDC.
I think when you find a bow that fits you, regardless of recurve or longbow, that's what will be most accurate. At least for you.