Common Sense & Lack of Variety

So I'm not by any means a professional player but there's four major things that make playing League a very annoying experience.

1. Invisibility is not invulnerability. To top this everyone with invisibility seems to have cloning or a teleport/gap closer except Teemo. When I lay down AoE damage as they're invisible they don't take damage. So with this in mind- when did invisibility = being intangible? This is really stupid and regarding the common pattern you have with teleports, gap closers and clones it gets annoying and boring fighting slightly different versions of another character. Also WHY do I have to buy a ward or AP item exclusively to reveal stealthed units? Make an AD item PLEASE.

2. Why are abilities that are homing/non-skillshot not able to be disjointed? This is singularly the most stupid thing ever. If Yi disappears and chops up someone in that small space and they flash out it should at least lessen some of the damage. To boot he doesn't take damage even if aoe is present. Nothing is so blindingly fast as to ignore explosions, ENVELOPMENT is a word that exists for a reason. If a homing projectile targets me i should be able to take sharp maneuvers, teleports or flashes will allow them to stray.

3. What's the point of depicting a character going into the air if projectiles or attacks below them STILL strike them despite being elevated above said attacks at that instance? Yasuo and Zac I can understand but getting hooked when thin air is touched or mines/ground attacks landing while in air is s t u p i d. This isn't as much as upset about being killed as much as the game pretends it's high-pitched action and yet you ignore such minute things that would give the game a bit more incentive to organize certain attacks or turn something around.

4. Stop defending Thunderlord's like it's totally not your fault the other keystones 'aren't good'. There's a reason almost everyone takes it now and that means somewhere Riot has failed to make a majority of the other keystones appealing enough to increase build variety. When Leblanc and Renekton just sit there and insta-proc thunderlord and other people see how ridiculous it is why wouldn't everyone take it? Seriously, almost everything that isn't Thunderlord or Deathfire is negligible by comparison save MAYBE Grasp/Bond and even then skirmishes go so hard in the paint at the start of a game is almost boils down to who Thunderlord kills first.