Just remember Southwest passengers: You don't actually want A-group boarding. On a full or mostly full flight, you actually want early to mid-B.
Sure: With A, you get to pick your seat. But with B, you get to pick who you sit next to, and that is wayyyyyyyyy more important.
Take an A aisle, and wait for Jabba the Hut to come strolling down to plop down next to you.
Or just be B, and find that nice doesn’t-fill-the seat small person (hopefully already with headphones in and a “no one talk to me” look on their face) and sit next to them.