That's the thing though. Things like SARS and MERS still exist in the animal reservoirs and could come back at any time. It never hit pandemic or even endemic levels. It's easy to eradicate something in a small geographic area with a small group if people. And you're right, the severity made it much harder for infections to be missed (I think it was less contagious too).
I was just saying that now something has hit pandemic level, it's unlikely we can make it go away. If we're lucky it will end up like the Spanish flu - people build immunity to the current strain during a few years and it mutates to something less severe.
It's got a more favorable symptom profile - unlike SARS-CoV-2, infectious people pretty much always have a detectable fever.