i can't speak for a small powerboat on the lake. I have been out on Narragansett Bay in Rhode island in a Pearson Ensign (22 foot Sailboat w/o and inboard engine) ..during an electrical storm. I touched the jib sheet track on deck with my hand and could feel a "Tingle" of electricity.
The jib sheet track was NOT
Bonded.
Twice..Later on, I sailed to Bermuda and back single handed in a larger boat that WAS
Bonded. Same conditions. No problems. Electrical storms happen all the time.
What is BONDED. All the significant metal on the boat is physically "Wired" together to
ground...like through hull fittings, a propeller shaft.etc...including the mast.. all goes back to the battery.
So what does this do: You have a mast sticking up into the sky. It is grounded to the water..Good. There is electrical energy flying around in the air above your boat..as Static Electricity. The Static Electricity "sees' your mast and and "goes to it" ...and DISSIPATES...just bleeds to ground because you are bonded.
If you were not grounded, the electrical energy flying around would Build Up (Not seeing ground) until it could not contain itself..And THEN EXPLODES on your un-grounded boat.
Solution: Be Bonded. All the through hull fittings on the boat (Outdrives, Outboard motors, etc.) and significant above deck fittings are physically "wired" together.
NB
PS: WIRED means Wired...with
wires running from one fitting to another.