My kids live in mt Lebanon and their school is large enough to require multiple class rooms for most grades
My daughter’s previous Catholic school was the same. Ask yourself the same question I did: are parents sending their kids there because they want them to be AUTHENTICALLY Catholic or because they just don’t want them in private school? I didn’t like the answer I got when I thought about that. And then she brought home a Common Core math book. I did a lot of investigating and soul searching after that. And long story short, I have found that the diocesan schools are indeed teaching common core. At least the math part. I started looking around and found a non-diocesan school that follows a classical curriculum. So I sold my house and moved. She now attends this school and we haven’t looked back.
The bishop of Pittsburgh is so so. He’s not ultra lib but I’m not willing to call him a conservative either. Yes we have good priests around here but they are certainly the minority.