As WatcherZero quite rightly says, the Manchester Metrolink acts principally as a cross-city rapid transit system, that has the advantage of both regenerating former heavy rail routes by providing a more frequent service with a better public image, combined with faster start-stop times between stations, and being able to run on-street to serve major local population centres and connect the outer areas directly with the town centres which is where people want to go.
Light rail and heavy rail systems both require reasonably high levels of population around the route in order to make them feasible, so it makes sense to arrange the stops around well spaced "nodes" (the traditional style stations) serving a higher catchment area in one go than a number of small individual tram stops, where the catchment area for each would be too low to show any benefits of the slower journey time incurred by stopping at them all.
For reference, here in the West Midlands, the various public transport modes are assumed to have catchment area sizes of 200 metres for local bus, 400 metres for light rail, and 800 metres for heavy rail, as regards demand modelling for the various systems.