A 2-block delay in achieving full illumination is puzzeling. Every dynamo reaches full power as soon as it spins.
I have never heard of a dynamo hub or lamp being stolen.
Removable battery lamps need to be removed every time you stop. I have dropped and cracked several.
Permanent lamps are one more thing you don't need to worry about.
I used to run a front then added a rear dynamo lamp. Don't delay.
The illumination provided by B&M dynamo lamps (and other premium brands) is considerable, my Cyo is generally the most powerful lamp I see around town. I saw one more powerful battery lamp once.
For cycling as convenient, hassle-free transportation, they can't be beaten.