I don���t know if we are all talking about the same thing. In my image, I have a class where I haven���t got the isAbstract defined, and so Calypso shows a red message - as it thinks I���m supposed to implement #execute (if it knows my intent that my class is abstract, then it doesn���t show the red warning). I think this is Denis��� question?

Sure, if I choose to use the abstract class, then its my choice, but as a lint checker -having useful warnings is helpful. But it is a nuisance defining isAbstract - and I���d almost prefer it assumes its abstract in this case (the normal expectations?) unless I tag it as concrete and signal to users that they might consider using my class (its probably a design smell these days though)