Oh, Man

if only Manchester Airport departure did lead to Liverpool Lime Street via Piccadilly

and

if only Mannheim S-Bahn knew to end in Heidelberg.

Both SAY that they do ...

If only.

 

Manchester Airport departures do go to Liverpool Lime Street via Manchester Piccadilly though...
https://www.realtimetrains.co.uk/service/gb-nr:Y25076/2026-03-28#allox_id=1

EDIT
Wait I think I misunderstood

 

Well they say they do because the services in real life do.

 

That's only because that's what the real life service does. It wouldn't really be feasible to create the entire line/lines just to match the name of the service since some lines are hundreds of miles. It wouldn't really be realistic if the service names only included what's in tsw

 

Yes I wish that from NY Penn I could go all the way to Chicago (2 ways), Toronto, Montreal, Boston, New Orleans and South Florida and it’s entirely unreasonable and lazy of DTG that I can’t

 

This is not the approach they chose.
They chose to do a bit here and there (unlike Simrail, which starts from a core and expands).
However, over time (as was the case for TS before), the isolated pieces will join together and form a network, but unfortunately perhaps not as extensive as we would like...

 

If only what?

 

I think OP is saying they want to be able to drive complete Manchester Airport to Liverpool Lime Street services in TSW, as well as complete Mannheim S-Bahn services

 

May be wrong, but I 5 think that was sarcasm.