Yes using snail mail in the 21C is appalling.
The letter requesting me to confirm proof of life never arrived and I only discovered why when I called the International pension centre and was told they had sent the request 3 months ago and as they had received no response, they suspended my payments.
I now call them once a year to enquire if a life certificate has been sent out, as it is supposedly a random process.
In my last call a couple of months ago, I was told Thailand is in line again in 2025.
I have to say that the lady I dealt with when I called about my payment not arriving, was very professional and helpful and my payment arrived 2 weeks late before continuing the 4 week cycle.