[skohan]

I'm not arguing that it's not a real thing, but how often does the LSP come up in your day to day life as a programmer? I have not thought about this once, and I do not think there is a problem this has solved for me in 10 years.

[mypalmike]

It's not always easy to discover interface commonality. But when you do and it's a good abstraction, there are definitely benefits over scattering ifs and switches throughout your code.