Yes Tango is no frills airline which means all extras are optional. It doesn't make sence to have everything same as AC why would it be a discount carrier then? Although WestJet may not have those restrictions at this time because they are competing with AC (or AC competing with WS) but this is how discount carriers work. Example: baggage allowance on Tango is still 70lbs as AC but on SkyService and AirTransat it's 44lbs anything extra is charged per KG