If you are playing Online I dont think this reduction makes a big diff , since online has so many other factors and isnt really consistent.
Your math is a little off. Even at the highest level a1.5 frame difference isn't going to make a huge difference. YourTV and internet connection are way bigger concerns.
If you playstyle is based mainly off reactive play and whiff punishing it makes a difference. In fact if you watch SEAM and compare it with other majors , you will notice some differences.
TV lag is standard across Fighting games , And I only play offline with the local scene on standard low input lag monitors.
I still think 6.5 is bad , but its a bit more reasonable now. Its like playing PS3 SFIV IIRC?
Your internet connection doesn't add input lag.
It doesn't add lag , but it makes things very hard to react to because of the rollback. You cant fully see startup of some animations. It definitely doesn't encourage reactive play.
It seems it could cause inpu to drop.
And then theres this. I stopped playing online , it doesnt really seem to help me improve after a certain point. And my current internet doesnt really get a lot of smooth matches
Pretty sure they only decresed it for PS4 controllers on PS4. If you're playing on PC or were using a legacy controller, nothing has changed..
Legacy controllers are banned from tourneys so I never played in that mode . And yea PS4 controllers on PS4 were made to match Legacy controllers.