The problem are the business agrements that they are putting in place, like with Sitecore where now Vercel/Next.js are the bless way to do CMS frontends, with .NET being left behind.

So it is either Vercel/Next.js with the out-of-the-box development experience, or DIY integration with other stacks that are also "supported".

And they aren't the only ones following such hype cycle.