The "therefore" in this case only works if you are going backwards. There is no therefore if you are forward-thinking this. First, diatoms and other filters are not the same - the structure of the diatoms filters differently. Secondly, the likely only hope is for organically bound toxins and not elemental or other types which cannot be filtered at all. Third, if you ever decided to use a diatom filter, you would be quite happy to change water again - very effective, but also very much a pain. Perhaps the most important thing if you are working forward is that nobody that I know of has been able to effectively use a micro filter in a reef for long - I mean nobody, but perhaps I missed one.
It is also backwards to worry about removing things that need to be added - this is just the game if you want to remove things that also need to be removed. You cannot separate these things no matter how hard you try.
I have heard all of these arguments for decades. Those who are in the hobby still change some water. They have lived what many on this thread are saying and their assumptions, working backwards, etc. did not work out. I think that if most folks put as much effort into reading about these experiences as they did trying to find some novel way to approach this, it might end up better for their tanks, wallets and minds.