At our parish we read only three of the OT readings. Always chosen by the priest.
Yes, that makes sense. I read that the new Pope reduced one of the services this Holy Week, presumably for similar reasons. You want the congregation to be glad they are there, not to be itching to leave.
For whatever reason, our priest at my present parish seems to enjoy taking as long as possible over everything. Whatever he intends by that, I don’t think it has the intended result—it just makes people long to get out the door. That’s definitely not what you want.
There are 3 which are mandated to be read the other 4 may be read.