I don't see how choice of programming platform & language has much to do with the need for real keyboards, function keys, ports, etc. Nor is it true that most developers using macbooks are only or even primarily 'Objective-C and Swift developers').

It is true, however that those developers I know who have a choice (ie. because they don't have a huge professional investment in Apple's platforms) are seeking alternatives to macbooks for their next replacement machines.