

I’m not European so my understanding of the issue may be off, but I would assume the trains are run by a private company whilst the decision to actually electrify track probably includes government involvement in each country.
Different countries may approach electrification at different paces, and having a vehicle capable of using both electrified, and non-electrified rail will give the companies flexibility in providing service along both types of routes.
Seems like a non brainer?
When we reach full electrification, these trains won’t be any worse off than any full electric variants. I suppose you can argue that the diesel engine becomes dead weight but like…how significant is that actually in contrast to…the rest of the entire train?

just don’t die