Why more frills in legacy economy than low-cost?
Why does legacy economy offer more frills - more legroom, recline, windowshades, free service et cetera - than low-cost airlines?
A low-cost has to offer enough service that the people do not desist from flying or fly another airline. If they do, the airline loses the ticket income.
A legacy which offers too little frills can likewise discourage people from flying or cause them to choose another airline. In which case the airline loses the economy fare as in the low-cost case - but lack of frills in Economy can also encourage the passengers, especially those who want to fly the specific schedule and can afford it, to buy Business tickets instead. In which case the airline gains the difference between Economy and Business fare thanks to having bad Economy service.
So, why are the low-cost airlines offering less service than legacy economy?