> Progress and backwards compatibility are fundamentally opposing forces, 
> those insisting on backwards compatibility are the ones preventing 
> progress. 

Because they are opposing forces, we need to balance them. What you say 
could be completed with: those insisting in progress are the ones 
preventing actual software to be implemented.

What is the point of progress if you can't harvest it ? Don't you see 
the drawbacks of a permanently moving target ?

Stef