Times when capitalism has been unhindered have led to market crashes, galloping inequality and depressions. Times when capitalism has been balanced with progressive policies have led to stability and growth, not only for the already rich.
That's certainly a respectable opinion, yes, but some believe that these progressive policies are only possible temporarily or in countries that use various legal and kinetic means to maintain an advantage over other countries, etc..., so it's not a settled question that social democracy is the end of history.
I think the trouble other folks are having with your prior comment was that there has never been an "Unhindered capitalism" anywhere on Earth within the last several hundred years. Religious, societal, political, etc., factors beyond, and in addition to capitalism, have always held significant sway in any society that has been realized so far.
Capitalism is to be understood as a political economy, not as some abstract economic-only concept that is impossible. A political economy is more capitalist in so far as private ownership of capital faces fewer restrictions and insofar as power is correlated to political ownership. Like all political systems, there are practical limits, but a system in which the power of capital is unrestrained and where very few restrictions to capital ownership exist can be called "unhindered capitalism", and these certainly existed.