Yes, makes total sense. They give tunability and the can get efficacy really up at lower currents. But the price/cost compared to other platforms like COB's is not exactly there. Almost 50% more cost for the same efficacy sometimes. So in the raw efficacy : price race, it's not a great choice. But if spectral signals/specialization is needed, it's very convenient to just drop it into a rig ready for COB's.
We have been making something similar for a little bit and has been working real well and made some spectrum chasing growers very happy. 36 chips 3535, in 36v or 50v configurations. Thermally perform very well, but we use a copper version. Blending is good and cob lens options all work great.
They come out between 1.9-2.0µmols/w depending on Tc ability of the build for ~100w of dissipation(same as a vero b and c for 20-25$). But creep to ~2.5µmols/w in the 40-50w range, and are as good of efficacy as anything pretty much, but cost again.
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EDIT:
@welight Have you got your hands on some of the XD16 yet? I haven't. The new XD16 chips could/should make these designs easier and maybe cheaper to get efficiency up.