Exactly. This is a good time, in my personal and professional life, to move back to Linux/Windows (which was my primary mode of doing stuff before I started buying Macs in 2010). I'm growing more aggravated with OS X (sorry, macOS (how about make it better instead of just renaming things, Apple?)), I don't really like what they're doing to their hardware, and the new MBP is not a good value for the money. I can invest some money and time in switching now without interrupting or messing with important stuff.

Isn't everything just pushing costs further down the road? Eventually you'll have to get a new machine anyway. If the current one works for you, it's kind of crazy to reject it just because you'll have to buy something else in a few years.

I fully expect that some day Toyota will stop making my car. But I'm perfectly happy driving it anyway, because it's still being made today, and it was made when I bought it. Does that make sense? Because saying "The Corolla will stop being made some day in the future, so I'm going to buy a Camaro now" doesn't make any sense at all to me.

The choice isn't "this machine or that machine." It's "stay on the same platform or incur greater switching costs later." It is a question of ecosystems, and one only gets more enmeshed with more use. There's nothing crazy about deciding whether to rip off the band-aid now rather than create more of a sunk cost to deal with later.