The only Sans I have at the moment flowered and stopped growing new leaves years ago, so now it's a pup factory. Which is actually perfect because space is limited by the window and I am more than happy to remove offsets whenever the situation gets congested.
Karen, I am curious which agaves bloom every year. The Manfredas maybe? I have almost no experience with that group.
The only repeat blooming agaves I know of (sensu stricto) are the ones like mitis or stricta which make axillary branches. Even my "Bloodspot" did that. But those new heads take quite a bit of time to reach flowering size.
It is interesting to compare all the different members of this family as to what happens after they flower.
My first up-close experience with a dragon tree (Dracaena draco) flower was this production, which halted the elaboration of new leaves for over a year
but the tree has since branched 8 or 10 times from the base of that inflorescence. In some senses (like timing and outcome) it's not too different from those branching agaves.