I'd say that "slowing pace of Mac OS development" simply isn't true; if anything, I've felt like there is more development going on now that iOS is creating a large pool of Cocoa/ObjC developers.
And also, it's still not less than ideal. Nothing has changed wrt. MacOS's openness; in fact, Apple continues to promote new APIs that are cross vendor (OpenCL, for example) with new releases of MacOS.
Apple isn't going to one day magically turn off "unapproved" applications with no warning; it will be a gradual process if it ever happens. Indeed, one must see the writing on the wall, but it has to be written first.
And also, it's still not less than ideal. Nothing has changed wrt. MacOS's openness; in fact, Apple continues to promote new APIs that are cross vendor (OpenCL, for example) with new releases of MacOS.
Apple isn't going to one day magically turn off "unapproved" applications with no warning; it will be a gradual process if it ever happens. Indeed, one must see the writing on the wall, but it has to be written first.