[bryanlarsen]

It would have been cheaper to build SRB's from scratch every time than it was to rebuild them the way they did.

[NortySpock]

True.

I wonder if they could have done a mid-life-cycle design refresh to switch to kerlox boosters to try to recover them on land...

Politically untenable, of course, due to the Thiokol corporation lobbying for solid rocket boosters but...