I have played in every mmr from Bronze to Plat, I have ended seasons in all of them. I'm currently in gold playing off roles and testing champions I enjoy. I do agree that bronze silver you will have a higher % of games that are just brutaly uneven. That being said all it takes is about a 300+ MMR gap (This is just a estimate. I wish to be clear here that it is my openion so please take it as such. im going of op.gg checks and personal experience when undervalued and on rare occasions smurfing to show a friend why they are not stuck in elo hell but need to adjust how they play.)
Last year I soloed Flex and started in silver, had no issue climbing to gold and flex is kinda.... special.
Here is my history.
Season 1, I was toxic, teammates where all shit, I was 2000+ elo in dota allstars as a Void, PL, TA, PA, medusa, BM player so clearly I kick ass at mobas and its just BS shit teammates that make me bad at lol. Nothing to do with me shit talking them, not adjusting my playstyle, aggressively picking fights 1 v anything.
Season 2, I adapted to the way champions scale got more used to AP being valuable (ap trist good times lol) And worked around teammates more.
Season 3, stopped being toxic in chat, worked on a wide champion pool and filling as needed which more or less made me a support main. Gold. Season 4 widened pool, fell in love with feast or famine playstyles when they work off being opertunistic. Gold
Season 5 hit plat, just kinda improved over all and moved off the island I lived on so I now had a ping that's not 120+
Season 6 Hit plat playing off roles, swaped back to mains after being stuck in Plat 5-4 for a bit and got up to Plat 1, Decided as I'm almost diamond im clearly awsome at mobas (again... Doh...) tried to duo boost some friends in bottom of gold into plat. End result was destroying my MMR and being demoted to bronze and walked away from lol in frustration for several months. That year I Learned that a 100% handicap on a team is never good and gets worse the larger the gap between their skill and the opponents is. they are a negative for your team in every game.
season 7, made it to play playing new champions and off roles. Also upgraded compture so I get more then 26 Fps on lowest settings. No joke, I made it to plat 2 years prior with under 60fps. I started this year with terrible promos after a nasty mmr drop. I was silver. Was not difficult to get it to plat for the 3rd year.
Season 8. currently in gold playing new champions and working on off roles. Expectation is I can easily climb to gold 1 or plat if I starting 1 tricking mains again, I don't feel the runes reformed has had a negative impact on my best picks. I do think its worthwhile to try and branch out
So theres my entire LOL history for you. I will change my icon to my S1 bronze. If you still need further proof because you doubt the accuracy of my discriptions let me know. It wont be difficult to provide you a screen shot showing I don't own Victorious janna but I do own Victorious Elise. Everything else shows up on Op.GG. Far as FPS and ping are I should be able to track down a few pics I posted on facebook years ago, but that would be a bit more effort then id enjoy putting in.