The trains are much better than Metrolink for longer journeys. Metrolink isn’t really built for long distance travel across the city. The city centre is too much of a pinch point, and a number of lines run on roads which restricts the speed they can go (some roads that Met lines are on are 20mph) or traffic can slow it down. I live in Wythenshawe and I could feasibly beat the Met from near me to the Etihad, on a bicycle.
The service is better for traveling between 1 and half a dozen stops. Having a Met line to Stockport would be best for someone traveling from Didsbury to Stockport, not for Matchday travel from the Etihad all the way back to Stockport.
It’s a shame so many pubs have shut around the Etihad. More pubs could filter numbers accessing the Met over a longer period of time as people have a few pints instead of just going straight to the Met.