I cannot speak about macOS, but I can about Windows. I've used Windows since I was 5 years old, for a bit more than 10 years. I've used Windows XP, Vista and 7.

I cannot speak about macOS, but I can about Windows. I've used Windows since I was 5 years old, for a bit more than 10 years. I've used Windows XP, Vista and 7. Then I've switched to Linux. Windows is frankly terrible. I've also tried Windows 8 and I have Windows 10 in a virtual machine (with plenty of resources). It's true that it has too many layers, too many services, too much in the way of doing everything. It cannot run for 15 minutes without some services that crashes or some windows that stops being responsive. Truth be told, the same thing happened, to a lesser degree, when I used Ubuntu (first distribution I tried). The experience was more pleasant overall, but the OS felt still too bloated. My journey among Linux distributions led me to ArchLinux. I've been using it for a few years now, and all I can say is that it's been exceptional. 99% of the times the package upgrades just work (and don't take 2 hours like on Ubuntu), I've yet to experience an interface freeze, and I'm extremely productive with the workflow I came up with. My environment is extremely lean: first thing I did was to replace desktop environments, which just slow you down, with window managers (at the moment I'm using Bspwm and it's the best I tried so far, even better than i3wm). Granted, the downside of this is that you have be somewhat well-versed in the art of Unix and Linux, but I would say that in most cases it's just one more skill added to the skill set. All of this to say that, in my opinion, un-bloated OSes are already here. The messiest component on my system is undoubtedly the kernel, but what can you do? Surely you cannot expect to have a kernel tailored to the computers released in the last year.