Actually, the Abellio train is a train from the German operator 'Abellio NRW' (Nordrhein-Westfalen), which is subsequently owned by the Dutch Railways 'NS'. That still doesn't change the fact that it is a train built to German specifications, and thus a German train. I believe the idea behind the Dutch Trainset was to not include trains from other countries, even if they partially run on the Dutch network. I may be wrong though, and I definitely wouldn't mind some more variety myself either.
You actually have a point there. I mean I always assumed that any type of train that runs on the Dutch network was included, but after some more thinking I realized that that wasn't the case. Because the set would then also miss:
- Talent (Enschede - Gronau - Münster en Heerlen - Herzogenrath)
- Break (Maastricht - Liège en Roosendaal - Antwerpen)
- Klassiek motorstel (Maastricht - Liège en Roosendaal - Antwerpen)
- FLIRT (Venlo - Mönchengladbach)
- DB IC (Amsterdam - Berlin)
- RailExpert's Alpen Express
- NMBS IC (Amsterdam - Brussels as alternative Benelux train)
And some (DB) goods trains most likely.
Do I believe they should be in there/want them to be in there (for variety's sake and for completeness), yes. Do I understand it if they're not, also yes.
One train that does run completely on the Dutch rail network and is not included is the Railpromo's Panorama/diner train, meaning two alternative NS1200 liveries and some odd different coaches.
Anyway, that's my two cents on the matter. It's easy to suggest things you can't implement yourself.