People always say that hybrid solutions are bad, but why?

People always say it, but never expand on it in depth.
Some hybrid solutions looks at Cardboard are super bad, but I'm seeing people saying it's fundamentally flawed and broken to even consider.

Every part of my being tells me that's BS people say to avoid putting in the work or some other foolish reason, but surely compatibility is possible if not a bunch more effort than anyone wants to go to.

So... why? Like specifically what is it about Forge/Fabric and Bukkit/Spigot/etc that makes this such a challenge?
Spongeforge was excellent back when I used to play 1.12.2 and I very, very rarely had problems with it, so it's clearly doable.

So why do people say it's fundamentally flawed? Is Minecraft itself not fundamentally flawed to the point where calling hybrids flawed is an irrelevant statement? I gotta be real, I don't quite get why there's so much stigma.
Was this page helpful?