In one round a lifetime

How many things can one do in a round, and how does it change the feel of the game? I am playing OD&D this week, running through Thracia with the amazing d4 hp magic-user, and I love being able to attack twice from range (if I don’t move). The OD&D rules for actions, fresh from wargaming, are odd and a touch fiddly. If we look at the action economy of a few different games, trad games tend to have more actions per round, and OSR games have fewer actions (for B/X based games like Shadowdark, 1 action and 1 move). I originally assumed this was a simplicity/aesthetic thing: OSR games made combat simpler so that less of the game was spent doing it. Combat is a fail state, yadda yadda. By contrast, trad games have 2-3 actions (bonus actions, reactions, pre-actions, alteractions, underactions, etc) because acting more often is fun (for the individual) and “heroic” because one person can make a bigger difference! Yawn. Let me know when your turn is over and I will stop playing Candy Crush or…