How do we get better nuclear technology? we iterate on it. SMR are an iteration to solve flaws in the previous versions. A quick wiki search indicates that they are designed to create less waste because of their higher burn-up rates. So yes, technology is on the horizon. Consider changing your assessment.

Nuclear waste? Some SMRs are also breeder reactors which convert fissionable materials into usable fuels. Consider changing your assessment.

The security issue is another board brush attempt to continue to scare people away from nuclear power. SMR inputs and output are not desired for weapons production because they are consider low-enrichment. And once fuel has been irradiated, it requires special handling for safety. So you'll probably die before you'll make your dirty bomb. Consider changing your assessment.

If you really wanted to attack SMRs, you really should say that, SMRs are "small" so they don't generate a lot of energy and have to be placed in many locations. This can multiply problems that exist. But that doesn't mean they won't have significant security, that is an (incorrect) assumption on your part. Consider changing your assessment.

Look, I don't expect to change your assessment, but I wanted to thank you for bringing me to read about SMRs. I learned a lot and had fun. I think SMRs are interesting and try to solve real problems with previous generations of nuclear energy. The addition of SMRs just add to what I believe will the best future for humanity, having a diverse and varied options of generating energy.