The reason why I think turnbet is super easy is because of their huge ranges. There are a ton of hands like Q7,9T,J6,............ which they will now fold. Even vs 2 oponents this is a perfect barrel card and certainly the best way to invest 1BB.
Equity Win Tie
MP3 37.19% 36.35% 0.84% 77-22, A9s-A2s, K9s-K2s, QTs-Q2s, J2s+, T3s+, 95s+, 85s+, 74s+, 64s+, 54s, AJo-A2o, K2o+, Q5o+, J7o+, T7o+, 97o+, 87o, 76o
SB 24.68% 24.29% 0.40% JhTh
BB 38.13% 37.30% 0.83% 88-22, AJs-A2s, K2s+, Q2s+, J2s+, T2s+, 94s+, 84s+, 74s+, 64s+, 54s, AQo-A2o, K2o+, Q4o+, J6o+, T7o+, 97o+, 86o+, 76o
That imo is the situation once the flop hits. If u assume you cant barrel them off at any point why would you even bet flop when clearly you are behind their ranges...that imo is a clear flaw since it seems obv that they will fold a decent % of the time either flop or turn or even river.
When they both just call flop their ranges change,rly strong hands get way less likely(overpairs,8x,sets)...Their most likely holdings are overcards,and there is soooo much of them...Lets take the worst scenario...that they both just call with their strong hands but they will also just call with all their crap since they either have gutshot,overcards or good BD draw.
Equity Win Tie
MP3 35.70% 35.13% 0.57% 77-22, A9s-A2s, K9s-K2s, QTs-Q2s, J2s+, T3s+, 95s+, 85s+, 74s+, 64s+, 54s, AJo-A2o, K2o+, Q5o+, J7o+, T7o+, 97o+, 87o, 76o
SB 27.94% 27.68% 0.26% JhTh
BB 36.37% 35.81% 0.55% 88-22, AJs-A2s, K2s+, Q2s+, J2s+, T2s+, 94s+, 84s+, 74s+, 64s+, 54s, AQo-A2o, K2o+, Q4o+, J6o+, T7o+, 97o+, 86o+, 76o
Hitting that turn actually improves your equity and you are not far from almost making a valuebet.If we take into account that ppl do raise overpairs or TP or even some other pairs sometimes then your equity even goes up
Then taking a look at their ranges and you will see how many weak hands are in the range and that they consists of about 30-50% of their ranges. If that is the range that they fold you can estimate that you will get them both to fold at least 15% but imo even more. That would make your bet about even money just from odds and outs not to mention that you will actually realise your equity on the river a lot better when you hit with initiative than without it. It also provides at least some balance to your turnbets.
Now lets look at the option of you checking. Its hard to say what are the ranges that they will bet here. Yes you may safe a bet when they decide to check back 4x,2x,Ahigh but against those hands your equity is obviously pretty good even on turn. Its also reasonable to assume that they will to some degree be bluffing here with their air(a hand like J5,T8,....) and quite likely that when they bet turn they will also barrel the river at least when it gets HU...so they will make you fold the best hand some portion of the time which would be pretty sad. All in all you are playing a much bigger guessing game by checking here just because you dont have as much control over their ranges.
Those would be my argument why I think betting turn here has much higher EV than cc. If this gets HU on the river then Im even bluffing on some river card just because I think oponents range will still include FDs,Ax,some SDs or even just whatever and you are getting pretty good price on the river.