Well if you TP to bot lane and kill them, you take those plates too. It's a winning trade (kills + 3-4 plates vs 0 kills + 1-2 plates).
Typically your jungler will cover your lane anyway. But if you guys decided to 4/5 man bot then you just took the entire tower, which is worth more than the potential 3-4 plates your laner will get.
The bounty system is okay, it got a little out of hand with the absurd CS bounty numbers, but they've dialed it back. They no longer rubber band straight ahead you after taking your bounty.
As for your overall opinion that solo carry potential got decreased and team snowballing got increased, I very much disagree. The game right now really feels like every role has a major impact now (except top, but atleast we have more than before with plates). Games are usually decided by whichever team has the most winning players. It's not like previous seasons where it was like "Oh bot lane lost? GG ff at 20". Now it's like, "Oh bot lost? Oh well our top, jungle and mid are all doing well so ez game."
And at the same time, it really feels like if your team is at a disadvantage (5 players, so when 2 win 3 lose) but you're one of those winning players, you actually have a chance to turn things around for everyone else.
And how does turret plating favor ranged champs? I play top lane, so I'm very familiar with the advantages of ranged champions, but their ability to take plates has never been one of them in my experience.