Helicopters have had survivability issues as seen in Ukraine -- given the aforementioned advantages of STOVL, it could be possible that there is a line of thought where STOVL aircraft become a replacement/upgrade for attack helos?
China's V/STOL studies, concepts & considerations
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Worth mentioning, that while helicopters do indeed suffer attrition when in penetration role (who would've possibly expected that to be a thing) - compared to anything ground, they're god level survivable.
I.e. there's probably no direct need for non-rotary VTOLs as emergency replacement assets - helicopters work.