If you use Google Flights, you can specify the number carry-on/checked bags you want and Google will include the pricing info in its rankings of flights which is handy.
I don't agree that airlines (or really any travel provider) should be required to include travel time to/from city centers though because not everyone is going to go into city centers. However, that'd be an interesting feature to implement: a feature that lets users specify their actual destination to get a fuller picture of travel time.
I think including the travel time to town centre is a good idea. At least it gets rid of the shenanigans that Ryan air does, where they say Frankfurt and the airport is in the middle of nowhere (1.5h from Frankfurt).
Also many travellers (except for locals) need to go to the town centre anyway if they need to access other modes of transportation. And if not, they likely would have looked up their itinerary anyway.
I don't agree that airlines (or really any travel provider) should be required to include travel time to/from city centers though because not everyone is going to go into city centers. However, that'd be an interesting feature to implement: a feature that lets users specify their actual destination to get a fuller picture of travel time.