Is that really a big deal? You barely notice any benefits between 2-4 versions on Mac. What's Mavericks? 10.10? And High Sierra is 10.14? I have a computer that is 10.9 or 10.10 and a 10.13 computer. I can barely tell the difference between them.

My 10.13 computer is my main one and was on 10.11 before when I upgraded only because I did a clean install right before the newest release. Don't remember noticing any changes.

I'm a huge Apple user but don't keep up with OS changes since they are so minor. This really isn't an issue. And if it's for business then the apps that are trendy and only for newer versions won't matter either.