I really like the description, but would like to add that infinities in the "size" of the universe could also refer to time:
it might be that there is an infinite future which we could possibly influence even if the size of the universe is finite.
I don't think that anyone expects this to be true with anything approaching certainty (due to entropy it seems likely that there is no possibility to sustain life/agents indefinitely), but it does not seem ruled out to me that there could be relevant loopholes like cosmic expansion ensuring that entropy can just grow indefinitely or other unusual scenarios (like the possibility to create a pocket universe by triggering a big bang)).
I really like the description, but would like to add that infinities in the "size" of the universe could also refer to time: it might be that there is an infinite future which we could possibly influence even if the size of the universe is finite. I don't think that anyone expects this to be true with anything approaching certainty (due to entropy it seems likely that there is no possibility to sustain life/agents indefinitely), but it does not seem ruled out to me that there could be relevant loopholes like cosmic expansion ensuring that entropy can just grow indefinitely or other unusual scenarios (like the possibility to create a pocket universe by triggering a big bang)).