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?
Do you have links of this MEW update? Because i constantly following any news and update of this ERC20 wallet but i did not read about this concern so maybe i miss to read it but until this moment all of my Crypto assets are stored in this wallet and i see no issues so its seems everything is fine and normal as before. So better share the links so that we can see if this is true.