Isn't it cheaper to build a HEMS in-house?

“Building in-house can look cost-effective upfront, but the hidden costs add up quickly: regulatory compliance across EU markets, connectivity to 500+ device OEMs, ongoing over-the-air updates and high platform availability are all non-trivial to maintain. Partners who started in-house have consistently found XENON faster to market, cheaper at scale, and easier to differentiate on top of.”