From various sources, MyEtherWallet (MEW) are not under development and maintenance any more. Even its founders has confirmed that they are switching to develop a new platform called mycrypto and encourage everybody to move there property to there.
But IMO, MEW or mycrypto is just a gateway to access your real wallet in the blockchain, so, both of them are still fine event MEW is not maintained anymore, right?
i am still using MEW because i have a coin that can be stake using MEW and i am happy to find that coin, i dont know that there is a development going on maybe i need to ask the coin developer if we they need to change something to be able to stake their coin other than MEW