Mordikaisers ult coded as crowed control?

Ok so I had a player on my team have this happen and it happened to my wife three times in the same match, both if them had been playing Morse and within maybe 0.5 seconds of ulting someone they were back in the non ult realm of the map, this got me thinking why would mordes ult be coded as basic crowd control and not a supression, being able to cleanse and use was active basically defeats the entire purpose of his ult and since the active can't effect enemy champions why was it coded to just break the ult instead of leaving morde trapped if the whole crowd control code was intentional?

Thoughts and opinions and maybe a red could toss in their two cents.