Leaning is called Heeling
It is different kind of sailing with different kind of boats, but the same physics are at work. There are lots of good book out on this topic, and there are lots of different opinions on this.Here are some very basic thoughts.For most cruising boats and most sailing conditions, when the wind picks up, you probably won’t want to sail under the jib alone. The main will help steady the boat.When the wind picks up, you shorten your sails, both main and jib, as appropriate. In fact, if you are heeling too much, it could get a bit uncomfortable for some sailors. You can reduce your sails, thus reducing your angle of heel, and you can often go just as fast as before, but more comfortable for the crew on board.As for your 42, sure you can handle that kind of sailing, but how comfortable do you want your crew to be? The 42 is a nice solid boat. In most cases, for most boats, you boat can handle bad weather or strong wind much better than the crew can.