It depends on what you're pinching. Pinching a lateral branch doesn't prevent the tree from growing taller. Pinching the dominant leader permanently eliminates it's ability to extend, but a new branches are almost certain to grow from the leaf axils near the pruning cut, all of which will tend to compete for dominant status. The small leaf in the axil of the leaf on the right signals a new branch is about to appear. In plants with a vertical growth habit, the new branch, and others near the cut, will tend to grow vertically and form a new leader.

If you pinch, try to avoid several branches emanating from the same general area. Also, rub off (with your thumb or a tool) new branches/leaders competing for dominance; or, let them grow for a bit if their spacing on the trunk is good, then pinch the co-dominant leaders back to an outward facing bud, making sure you pinch them back so they're all different lengths.

Image of co-dominant trunks here (click me).

Al

Butting in on this post. Can't find a way to start one of my own. I pinched my FLF and started the cutting. they are both growing like mad, can I slow this down some way>? The mother plant has 5 new leaves already and the baby has one new leaf that is huge.

As a bonsai practitioner, I've learned the intermediate goal, when your ultimate goal is to limit a plant's size, is keeping the plant healthy and growing well. Then, you can easily limit size by way of pinching and pruning. The ficus below is about 15 years from a cutting - still quite small.

Al