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Hang-on filters can still be used for large thanks, just that they tend to have less space to hold bio-media and there are less options to adjust the flow direction and circulation. If you are running a planted tank, good circulation is important as it brings Co2 and nutrients to the plants, otherwise there will be deadspots which result in poor growth or algae issues in those areas.
Canister filters can usually hold a lot more bio-media and you can customise the outflow and inflow to maximise flow and circulation in the tank, so it's a comparatively better method of filtration for a larger tank.
Ultimately it'll all depend on your livestock bio-load and circulation requirements, if you use hang-on filters and everything is fine, then no need to change them. But if you find that the water parameters/cycle are unstable or plants are not doing as well, then may have to consider upgrading the filtration to canister filters.
There are other effective options for filtering large tanks too, like sump filtration (if you have the space under the tank and can customise the tank to use overflow pipes or box) or overhead filter (if you don't mind mounting a large filter unit on top of the tank).
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