MCT is an official time set by airlines and airports.
Many people aren’t comfortable with the official MCT, they feel it is too rushed and doesn’t allow for delays.
If you are booking a ticket you will never find connections under MCT. If you’re happy with the times of the flights offered you can go ahead and book them, safe that if you miss the connection you will be booked on the next available flight.
However, if you don’t like the official timings, you can try and mix and match different connections. 2.5 hours is a good measure for most airports, but many worry that if the inbound is delayed an hour they’ll still be rushed.
It’s really up to you! And your level of comfort, and the importance of the event you are going to.