Why concatenative programming matters?

$SUBJ. Explain me. It seems that concatenative folks are total opposite of what SICP taught me:  where SICP suggests immutable data, concatenative suggests dup and swap.

What am I missing? Is concatenative programming as big joke as it looks like?

If there were a One True Way to write all programs, they would be trivially written by now and we wouldn't be wasting our time talking about them.

>>1
Yes they are a joke. However, it is nifty to have a programming languages that doesn't need any parsing stage at all, just tokenization. And it can be fast too. swap dup mul ery day. It makes swapping less dup dup swap xor add sub eql and ifelse.