SA ILS mainspring / housing

I see another post about swapping out the SA ILS mainspring housing to standard:
Unless you're changing between flat or arched--or maybe doing a full build:
Why? - 
especially when you have to change some other parts too.
I like the ILS housings -easy to work with w/ the take down pin. - Wolff has a full range of reduced power mainsprings for the ILS housings. -- 
??, Russ

I don't own one but from what I've read swapping it out has improved the trigger for many.  Also by installing the std MSH you can pretty much follow spring recommendations that have been made from years and years of experience.

- Dave

And, you can use all those standard springs you have laying around.,

inconsistent trigger pulls is why I dump them