Like others have said, it depends. 2019 played on a team last summer with 30 guys on the roster so pitching was not an issue. Getting all of them enough work was. At a certain point, the only tournaments worth going to are 5-8 days. The top 3 guys would throw 3 innings or 60 pitches in the first three games then come back for the playoffs trying to throw full games. The rest of the guys would come out of the bullpen or have one full start. Not everybody was happy but they all know their role and it worked. When you play 7 pool play games you need pitching to go deep in the playoffs.
The coach wanted the players at every game to make sure it was a team and not 28 guys flying in every week. But if you went to him and said I can't drop 600 on a hotel for the next 5 nights he would find arrangements. Not all the parents went to every tournament so most of the time a bunch of them would split a room to save money. One kid stayed with us and just paid for a cot and his dinenr. Blowup mattresses when it was drivable. Coach always flew out a day after incase any of them got delayed or missed flights.
As far as camps and showcases. It's about getting recruited not winning games, so you gotta do what's best for you. But if you find yourself missing multiple starts for showcases, you're probably in the wrong place to begin with.