Researchgate can be a platform as you are able to comment or give feedback on other researchers' work. Based on this, we can actually start off a healthy discussion constructively.
Is there a website where researchers provide and discuss their insights/feedback about scientific papers in details ?
Agreed with previous researchers / scholars' comment i.e. ResearchGate, Academia.edu and MyScienceWork etc. allow researchers to provide & discuss their comments about scientific papers uploaded.
The appropriate websites exist, in agreement with the colleagues, but, I do not know if researchers are willing to use these websites as pointed out in the question.
Hi I think Phd bound researchers have yet to fully capitalize on the the social media platforms. A lot of older Phds seem to be using old fashion email lists and usenet groups, as well subject specific blogs and websites.