If it's on a single ticket I would not be worried about a 90 minute connection time to be honest. If it originates from the UK/EU, you will often be due some pretty hefty compensation (£520) if the connection is missed, so it's just not in the airlines interest to sell you the ticket if it's likely you'll miss the connection.
My point is that they aren't common, regular and frequent issues, otherwise the through-fare tickets in question would not be offered.
MCTs exist and historical flight delay data is used to calculate the risk of missed connections, amongst a dozen other variables.
You've as much chance of missing a connecting flight on a through-fare ticket as you do by having a 2+ hour departure delay.
Take a moment to think about how many airlines would be going bust if they had to compensate travellers as frequently as you're suggesting they may occur. Most airlines are one hot summer away from going bust.
I don't think you get what I am saying.
It is NOT the question of their intentions and fears of fines (I too got that compensation when I missed my connection), I know they don't want to do that. My point is that there are a LOT of factors that can turn a 90min layover down to 60mins or less. I know the missed connection is not a common one, that is not disputed. What I am disputing is that you are saying it is an absolute that it will never happen because it's not in the interest of the airline. We agree on that point. What I disagree with that the probability of someone sitting in economy, to an unknown airport for the first time, perhaps with people who need even more handholding, without priority check in and more luggage etc etc. Factors that will make the 90mins feel VERY short.
And....why on earth did they close my gate 30mins early when they know i am not on it?! It is not the first time it happened, I have been on several flights that the door shuts anything from 10mins to 20mins earlier than the scheduled time take off time.
Things like that...I just don't trust it when it is "90mins" layover. In my mind, that is only a 60mins layover. So I need to work back in my mind of all the things that can go wrong.
90mins....now we are at 60mins.
Take off 15mins from previous flight late from taking off.
Take off 15mins from being stuck on the back of the plane in economy
Take off 15mins to get from gate to gate
We are now with only 15mins left as buffer....For an cross planet journey hinged on a 15min buffer....I just don't feel comfortable.