Depends on the job. It is quite alright to be a generalist and have a broad understanding of everything. It allows you to connect different fields, come up with simple fixes for nearly everything and call for an expert if it’s beyond your perspective. Apart from that there are jobs that don’t require knowledge. Maybe instead strength, patience and dedication or empathy.
The dangerous part is if you don’t know your limits. If you’re a dilettante and then start opening the panel from the circuit breakers and mess with the wires, you will probably burn down your house.