Probably better on balance, but not strictly better. On the one hand, it gives you greater security when used perfectly. On the other hand, it has a cognitive

Probably better on balance, but not strictly better. On the one hand, it gives you greater security when used perfectly. On the other hand, it has a cognitive overhead, and a worse failure mode (you forget that you've left it writeable, and won't have the light to give you feedback). So even better would be a hardware lock for writes and a light indicating when writes happen.