More has changed in laptops from 2007-now than I predict will change from now-2021.
HD screens, SSD hard drive, USB 3.0, HDMI, etc.
These are recently refreshed, and should serve you well for years to come. of course, technology is constantly updating, but future refreshes (in my opinion) will be less revolutionary than they will just be marginal evolutions in the product cycle (i.e. smaller, lighter, better batteries, etc).
Macbooks are expensive, but work very well. I paid close to $1.9k for my 15" MBPro. VERY overpriced, but I use it all the time at home... and frankly, I can afford it every 3-5 years. If this one lasts 4 years, I'll be satisfied. More than that, even better.
Of course, if you just need something to meet your needs, than there are plenty of <$500 windows laptops that you can find at almost any place that sells them that will work just fine.
I personally like the Mac interface for personal use, but am under no false impression that it is a good value. It's not. It is a luxury item.