. . . . and my personal opinion is that the quality of components used and the quality of workmanship made a big difference.
In college we studied the aluminum wire & causes of failure. The quality of workmanship could have prevented most, but the window for getting it right was small & the smallest things could lead to failure.
In spite of this, I listened to the counter guy that assured me that 'EVERYONE" was using alum for service entrance.
Once a year for several years after I installed the alum wire from the meter to the house panel , I'd have to re-torque the connections inside the house panel, but never in the meter can.
I looked for a difference & what I noticed is the meter base on my house has a large heat sink at the lugs, the breaker inside the house panel does not. I'm guessing the heat made the biggest problem at the connection. & yes, I did use the proper no-ox paste & a torque wrench as per the instructions with the breaker that was rated for AL-CU