That's a negative.
It exists because Apple has officially become that which it most previously despised -- banking on incremental improvements to established hardware.
None of the iPhone, Watch, or iPhone upgrades have been revolutionary or exceptional, just marginally better than the last one. 15% of this, and 10% better at that. A software improvement or three. Whee.
The reality is that Apple is just doing what all other hardware vendors do: hype up the new and devalue the old. This computer should exist because its processing power is marginal when compared to other platforms and it needs market relevance. Just like all the other vendors. This is the hardware Circle of Life.
I don't want to say it's bad, but if you're entrenched in Apple hardware you can pretty much guarantee that every few years you can just replace your old item with a new item that has more compute/storage/etc and software that is pretty much just the same as you've seen. This makes this hardware a necessary element for those with 3 year old hardware, just looking for an upgrade.