For starters we are talking about concepts, not actually built and tested reactors

Oh so you’re saying you’re completely full of shit because you’re talking about the theoretical consequences of theoretical devices that don’t even exist yet?

Yes we can make reasonable predictions about things that don’t exist yet but you are acting like it is a forgone conclusion. Unless you are actually involved in the field your opinion is, at best, as good as anyone else’s . I would say that to you or to any of the myriad of Tech Bros who are all fired up about small reactors like a cryptobros are about their next meme coin. You’re either an evangelist or expecting Armageddon these days. People don’t just wait and see or have less exciting takes. It’s “this is the greatest thing since fire” or “it’s going to kill everyone.”

Counter example to your quality and safety arguments: cars and car engines. Larger, higher output engines in larger machines require higher quality checks and safety regulations. A car engine isn't generally going to rip your arm off or produce an explosion that can level a building. Plenty of larger machines/engines can and will.