Value wise, it's potentially a competitive advantage. Product differentiation, facilitate specialist niches that the commodity engines don't.

The performance advantage is real. Getting to 85% of the visuals there is 'easy'.

The last 15% is where the waters get muddy, the predators fierce and the black obelisks loom high.

For most teams, most projects, it's probably a boondoggle. As an indie, your use case basically needs to be really simple and performance dependent.