I agree it’s a bit of an operational headache compared to using WH and CNs line in general. But, there’s something about the age and history of access to TH&B that precedes much of GO- it feels like they have an implicit commitment to service this station ad infinatum, even if it isn’t on the radar for modernization atm.
I do wish it would be easier to upgrade service here. No other station has to deal with a tunnel driving up the cost of improvement. Luckily Metrolinx seems to want to upgrade it, albeit on a longer timeframe.
I would probably only be ok with them switching to CNs line (exclusively) if they renovated Liuna Station as an expansion of WH, seeing how much platform space could be reactivated… but there’s still no reason to close this station. I would love for GO to at least consider options for tying back into CNs line further east, though.