Boom Holder Thingy ?
Forgot your second question....
Modern boats are less likely to have boom gallows because they tend to have solid boom vangs to hold the boom up instead. Having a fixed gallows also requires the boom be high enough up to clear it under sail. This raises the center of effortt of the sail, which is not good. It''s also desireable to have the gallows high enough for crew to walk under without ducking. Unless the boat is big enough, this can look quite ungainly . In smaller production boats, a gallows would take up a lot of room and could get in the way. (Some gallows are hinged so they can be folded flat onto the cabintop or deck, or are fitted with pins so they can be removed and stowed when not in use.) Not everyone needs a gallows, but people who wantt them usually end up with them - or a boom crutch.