Why are towers always buffed in the weirdest ways?

They are never just straight buffs to tower durability and damage, which is what the majority of players want (?). Instead the towers get 300 more hp which is like, 3- 4 autos worth of more hp which is fine but now they take more damage from minions. So its a minor buff with a minor nerf and then, minions get a whole 25 more movement speed when near them, which is an odd change Imo. Why can't towers just get more armour or straight up durability? or more damage. I just don't understand. It feels like Riot doesn't want to buff the towers so they give them a small buff and a small nerf at the same time just to make the player base think they are trying to make towers better.
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