HS sports officiating supply has been dwindling - even before covid... There's another thread about where hsbbw members sit during games. In that thread you will find a reason why there's fewer umps - parents who don't get it and why we don't sit near them... Feeling entitled to attack the coach/umpire or talk smack about others children - yikes. Administrators / coaches fear for their jobs from parents that will go above their heads. If a player or coach gets ejected from a game, there are repercussions including suspensions, taking anger mgmt / sportsmanship courses, etc. An umpire cannot eject a parent only an administrator / coach could do that. Imagine a coach stopping a game and telling his star pitcher's parent to leave because he's riding the ump for a single pitch his son didn't get called his way. I had to track down an administrator recently who was sitting way away from the "fans" who were riding the opposing pitcher because of his weight. Once he moved closer the jeering stopped, but no other parent or person nearby dared to step in and say knock it off. The coach knew who it was but was not getting involved.
Time and pay wise, yeah other sports make more per hour. You have to love baseball to want to take 4+ hours out of your day (travel, game, travel) for what you get paid and deal with a few ignorant parents. Many associations have mandatory off season training and then there's the FED test. I have to wonder how many parents would get an 80 or better on an open book test of FED rules. How many can track 3-500 pitches a game satisfactorily and judge in real time safe/out, fair/foul, balk or not, etc. While roboump could solve one problem - I think it would shock you how the game would change at the HS level. It could be longer without the ability to steal a strike. For the most part, pitchers aren't that good yet with control.
Umpires aren't blameless... In some associations there's an old boy network to get to the good/better games. Then again, imagine how hard a 1st year umpire would be ridden at a cross-town rival game when he makes a mistake... Those that are new sometimes have grand dreams, but some of those that have been around for a while don't want to let the newbie get the experience. It's a balance. The newbie gets discouraged and moves on. You can make more per hour at travel or tournament games which are usually timed and you can do 5 or 6 games in a day.
One final thought - the players aren't getting any younger and neither is the average age of the umpire. In a sport where the age of the player is constant, but the age of the umpire increases eventually supply runs out - it's only a matter of time.