Taiwan just (slightly) relaxed Dual Citizenship Rules

yes, but it gives you some more peace of mind. No need to update periodically the ARC with banks or others and, most importantly, the driving licence will expire on your 70th bday like with citizens. That’s so nice not to have to go to DMV every now and then to get a new one.

Tell me this doesn’t mean 70+ year olds aren’t allowed to drive?

You need to renew I guess with a different process, over 75 every 2 years they need to have fitness tests.