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Unreal’s current BSP system really needs to be deprecated entirely and replaced with a new system, which I believe is the plan. Which is great, but it’s probably going to be a while 
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Heck, no.
Golden rule in programming is that “newer and shinier doesn’t mean better”.
BSP approach worked for years in other engines, and deprecating it completely would be downright silly.
“Completely new system” will take years and projects are being built NOW.
It will be better to just fix the bsps.
Or FIRST build a replacement and only THEN deprecate stuff.
Otherwise it’ll be like that situation with cascade. UE Answerhub says that cascade development is abandoned, except the “niagara” replacement for the cascade isn’t there yet.