Why did Riot rework Mordekaiser in the first place?

I don't know where the whole "shoving Mordekaiser in the bot lane" came from but it's very unusual. You shouldn't really experiment with old champions, that's what new champions are for. e.g, Kindred is suppose to be an adc and a jungler and Riot's intention was very successful. Mordekaiser on the other hand, Riot should've reworked Mordekaiser so he's more healthy in the top lane but stronger in a way.

Right now, Mordekaiser is garbage. Most of his damage comes from his Q and if you can't hit anyone with your Q, then you are as useless as paper. Before the rework, Most of his damage came from his E, R and those abilities have range. In addition, he had good base stats and right now, his base stats are really bad. Just as bad as anivia or Zyra.

If Riot managed to rework Mordekaiser again, how will they pull it off successfully without making him toxic or lose his identity? The one thing that makes him unique is the fact that he has no mobility and utility. How will they pull it off without making him garbage or overpowered as heck?

In conclusion, it's obvious that the Mordekaiser rework didn't go as it planned which resulted in a massive backlash. They should experiment with new champions, not old champions because it results in a massive backlash.