Yeah, it felt a bit like me (a software developer) recommending to someone to use Google Cloud for their blog infrastructure rather than some basic one-size-fits-most solution that may or may not meet their needs forever.

These people come from civil engineering backgrounds where air filtration requirements might often be thought of from an industrial or at least much larger than a domestic/micro loft scale.

Having any air filtration at all at a smaller scale is generally just great if you replace filters often enough, don't aren't near industry or aren't in a city, don't cook at home often... Even then, a smaller air purifier's going to do an awesome job if you let it run regularly.