Blocktime doesn't change. Also the halvings are predictable. I am not sure you understand what point I am making. Monero has had SEVERAL changes to its issuance since inception. And it is not foregone to conclude more changes will happen. That makes its supply unpredictable. Bitcoin has had precisely zero changes to issuance. (Spare me the inflation bug rabbithole because it was caught and fixed immediately, also never intended). This is my point. Again Monero is private and neat and all that good stuff. Just when it comes to economics it needs a bit more scrutiny.