Normally I wouldn't be huge on picking a D man in the 1st round either, especially in a year where they haven't really played meaningful hockey. But with the current roster set up I think this is the year to do it. They currently have 12 forwards and 4 defence signed going into next season. That means if they select a D man at 17, he will have the opportunity to have a steady spot in the lineup.
There's just not much ice time to go around up front. Pinelli, Petizian, Valade and McDonnell will eat a lot of minutes. Langdon, Serpa and Dickerson (if they keep him) are all older players now. Fishman, Sop and Martin are all 18 and looked like they were going to be promising young players in 2020-21. LeBlanc and Swick are both in their NHL draft year. So unless Luca came in hot like his brother did, he would probably be buried on the 4th (maybe 3rd) line all season