Notably, people in the latter group never assume THEY will be the ones suffering for the future.

What makes you think so? What evidence do you have?

Yes, some people think effective altruism means helping people here and now as efficiently as possible.

Most effective altruists seem pretty relaxed about the 'here' part, but you are right that the 'now' part receives different answers from different subgroups.

Others think the sheer number of potential sentients in the future justify any amount of suffering tolerated in the here and now.

There's also the people who care a lot about shrimp. They are less crazy than it seems at first.