The same experience as well. Last month I forgot the road on the address of a order, just the building, in Bangkok, one of the biggest cities in the world.
Package still arrived, as I had assumed. In my opinion it works as well or better than in Germany. Same for the public transport, but that's another issue.
As with many things in logistics, it depends where you are. If you're trying to have a laptop delivered to a small village near, like, Chiang Rai, your experience will be different than if you were having it sent to Silom in Bangkok.
Chiang Rai has train, air and road access, and the roads in Northern Thailand out from it as a hub are excellent too. I’ve seen enough logistics vans here navigating the small number of dirt roads, and I’ve had frozen food delivered to islands without road access from Bangkok in a refrigerated vehicle the whole way too. On the whole, logistics here seem on a par with the UK which also has a few hard-to-reach areas.