We had many custom deliveris.

[Jojoya]

The only real problem are the achievments for the 150 deliveries. It takes 88 weeks to get them for all NPCs - that's 1.5 years! And in the meantime they will add even more NPCs for deliveries...

Unless SE increases the number of new delivery NPCs added each expansion from 3 to 8, there is no danger that it will be impossible for new players to get all the 150 delivery achievements. They may not be able to do it in a single expansion but there's no reason why they would need to. The achievements are there to give players things to do over time. They aren't an obstacle to progression.