You have to differentiate between ‘world partition’, and ‘level streaming’.
WP is the new Epic offering. You would just lay everything out in one go, and the grid system would do all the loading and unloading for you.
LS is for when you want finer control. It’s the same sort of concept, and no doubt uses core code with WP, but you have to specifically say which bits loads when, using either blueprint, or volumes.
I would say, maybe, WP is a possible route for you. As the player positioning, spawning and control is much worse with streaming that with ‘open level’.