First I was programming in C and I was told C is bad and I must move to a better C -> C++. I listened and moved to C++. Then I was told C++ is horrible and I must switch to modern OOP langauges like Java and C#. I moved more than 15 years ago and I am now very productive when delivering solutions using C# and Java.

15 years later, I am now being told to dump my decade and a half knowledge and competitive advantage and learn a new programming paradigm? Miss me on this one. This time around, I will stick to what I know best. OOP has 80% of what I need and I know ways to deal with 20% of the problems. I will stick to it.

It took me only 2-3 days to learn F# but I feel I will be doing my clients a disservice if I have to start from scratch and start delivering solutions to their problems using a programming paradigm that I have little experience with.

No. Thank you. I will stick to delivering solutions to my clients using what I know best.