yes I also often see posts like that on this forum but I never pay attention and I only think if it is FUD and think people who say that don't really know ethereum
I see that. Mostly FUD came from the competitors or haters. They do know about ethereum but they tried to deny the fact about ethereum. This is happening when there's a new platform being released to the market and the supporters of its platforms will spread FUD to attract more users to use the platform.
I remember some big names were spreading FUD for ethereum while they did know ethereum so well.