Why di Riot delete Tham as a champion

I played Tham again today for the first time in a long while since I haven't been playing much league. Just to discover that they basically nerfed Tham to the point where he Is no longer a viable champion especially not in top lane. Why did he get nerfed so hard just because they wanted to make pro play more interesting? Did they not take into consideration the other 98% of the player base? The same happened to Shen where they nerfed him till he became nearly unplayable because of pro play. This isn't right and Riot should fix it.
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