Can you stream multiple releases in parallel instead of doing them in series?

E.g. release A has 75% back-end, release B has 75% front-end. You can have front-end devs finish their work on release A and then start on release B before release A is out. (Though, obviously, not that simple. You'll need at least one front-end dev to stay on release A to solve integration issues, and you'll probably need a back-end dev to create endpoints, etc, on release B. But the principle holds, still).

It's more efficient to keep everyone working at their fastest, most productive (and enjoyable) tasks whenever possible. But it does take more (and better) management to handle it.