Newer vans (euro 6) like my Toyota Proace do have a more complex exhaust system. They have DPF, and SCRT which uses AdBlue.
The more complex something is, the more there is to go wrong, that’s true. But this new van uses about a third less diesel as my old one, (despite having a more powerful engine) so it’s swings and roundabouts.
It also came with a 5-year warranty, so I’m not too worried.
My previous van just had DPF and I never had any issues. In my opinion, the key to trouble-free motoring is just getting it serviced exactly as the manufacturers instructions.