Malaysian Airlines service declines as it has eliminated the checked baggage allowance from its lowest fare tier. Details here.
Living in Malaysia I have, of course, flown on them many times. Sadly there has been obvious cost cutting over the years. And yet the airline continues to lose money. They also reduced their long haul routes. So I, and presumably many others needed to fly on other airlines.
Many full service airlines have adopted practices of the low-cost airlines. I recently flew on Singapore Airlines. To Japan. And was surprised that, like Malaysian Airlines now, if I wanted to choose a seat I had to pay extra.