This is just another step toward the iPhone-ification of Apple's desktop computing. It wasn't the first step and it won't be the last.
Rather than engaging in a verbal tug-o-war every time Apple takes such a step, I find it more beneficial to reflect on what that step means in terms of continuing on in Appleland, getting more deeply entrenched, or planning an exit strategy.
Those who are pleased with Apple's actions to lock things down further will dismissively reply with, "then go to Linux". Those who aren't will engage in hyperbole like, "I'm being oppressed! I want to be free!".
When people strongly complain but shrug their shoulders and continue on buying Apple hardware, software and services, it comes off looking like they're simply venting. They'll justify staying with Apple by pointing to things like Messages and iCloud. In a way, it is an attempt to absolve themselves of the responsibility of having to make a decision. "I wish I could decide to leave, but I can't."
The truth is, nobody is a prisoner of Appleland. Apple has telegraphed for years where it is going with regard to their hardware, software, and services. Regular members of MR (should) see this.
If a person has honestly "had it" with Apple, they can plan an exit strategy that won't cost them more money... actually, when done correctly, they can SAVE money by a steady well-planned migration.
I've had a long-term plan to phase out Apple. It happens one piece of hardware at a time, usually when it is time to replace a piece of hardware. Sometimes Apple produces something that appeals to me so I'll buy it (like the iPad Mini 5) but the general direction is toward non-Apple products and services.
For those who want to do something similar, I encourage you to first and foremost, confront FOMO (Fear Of Missing Out). Apple has done a masterful job of building and stoking FOMO in their customers. It is perhaps the single greatest reason why people replace their current Apple product with a newer generation even though the current device is still very functional and doesn't impede how the person uses the device.
Every device that Apple produces is "amazing and ground-breaking".... until... the moment they announce the next generation. In that instant, that device that was "amazing and ground-breaking" a moment before, becomes a stuttering laggy hot mess.
I think Apple learned that from car sales. The salesman tells the customer how great the car is, built to high-standards of quality, and will last a decade or more. But by the time the customer gets to the finance office, they're told that they need the extended warranty because the car will be on the verge of falling apart or bursting into flames the day after the base warranty expires.
Apple still makes good products and services, but as they change, they might no longer be as good of a fit than it was... and that's OK.