It’s not a matter of arm being ready to go. A 16” arm mbp could be ready to go now, but many businesses aren’t anywhere near ready to make the switch. Who knows how long specialized software will take to be transitioned, on top of which there needs to be a long testing period to make sure all the kinks are worked out. Because businesses can’t afford to take unnecessary risks and because of slow niche developers, it could take much longer than the official two year transition. Two years is a fair warning to get as up-to-date hardware as possible to mitigate the transition. But if Apple doesn’t update the 16” intel mbp during the two years, then its last update happened BEFORE the announcement, making the announcement not a warning but a surprise switch.