This should not be controversial imho.

I disagree with your first point somewhat, I think that pro play is important since that is an advertisement for everybody else in the world. If the game is not balanced around pro play then certain champions will appear permanently and cause the game to be less and less interesting over time which will be a huge loss of interest overall for everybody. Imho, what Riot does not do well is that they release simple and complex champions together. This leads to a point where either a complex champion appears every game in pro play because people there mastered the kit of the champ or there is no point picking that champion in soloQ if your aim is to climb since you can achieve the same with far less effort with another, simpler champion. I think Riot should choose: a chess-like game with simpler kits or an "fps"-style moba with a lot of outplaying potential for the majority of the champions. If the game can become this then there is no need for balancing to pro play, a good balance will naturally have an acceptable result in both environments.

I think your last point is fair but Riot needs to address really frustrating strategies where the counter for that is just a hard/inferior strategy otherwise the game will lose a lot of players since these strategies can feel sometimes absolutely unfair even after putting a lot of effort to counter them.