Silver has a HUGE player base and significant variance in talent. I created a smurf as well to play ranked with my friends in Silver and Bronze. It isn't really a smurf account anymore, I kind of got it into Gold from winning a bit too much. So I have my main in Gold II and what was my smurf in Gold V.
Either way when the account was in Silver, I noticed Silver players had a lot of tendencies/habits
They chase kills more often
They lane longer sometimes 20+ minutes - My record - had a game where people laned for 35 minutes. NO TOWERS FELL. Everyone sat in lane and farmed while the junglers farmed. I was Nasus so I thought it was SWEET.
Overly aggressive - they try to trade ALOT but they miss CS.
Trouble farming under tower; which is why they tend to die a lot in lane: They contest farm they shouldn't instead of letting it crash into tower
Do not understand the significance of level differentials (or they don't respect it)
Not great with objectives - they know they are important, but they do not know when they can take them unless it is "free"
Not good at playing from behind and are easily discouraged - Starting a game where the kills are 0-4 in the opponents favor they will get discourage and often play worse because of it
Gold player have their own set of problems too, but I think most Silver players are mechanically OK with their champions and they can CS adequately. I actually do think there are a lot of Gold caliber players in mostly high silver. They either play too many roles or too many champions to climb though. It seems like most silver players think they can play 3-4 roles well and they have 3-5 champions per role.
I honestly think that's why some of them stay in silver because none of them get great with a few champions, they just stay OK with a bunch of them.
I literally only play 3 champions pretty much. I have 2 other champions for when I am called upon to play an off-role.
I play more champions in normals, but I quickly realized I couldn't win with some champions and just specialized my pool further.