I am also not an economist, but I'd like to frame your Austrian/Keynesian comparison with another one:
Underinvestment (Austrian): There is less investment due to risk being less preferable to steady savings. Example: I won't risk 1 million dollars today on a risky investment if my 1 million dollars next year will be worth more.
Overinvestment (Keynesian): These is over investment due to inflation outpacing savings. People are forced to invest in risky ventures, as at least there is a chance you can earn money as opposed to losing money over time. Example: I risk my 1 million dollars today on a risky (subjective, I'm referring to -10% to 10% gains) investment and if not, will definitely lose 5 percent of that money.
I'd love to hear your thoughts on the matter. Personally, I see strengths in both styles of economic policy, but believe that in our current economical climate, we are overinvesting and through central planning, mis-investing by stimulating the top echelon of investors who simply buy property (real estate asset prices go up), businesses (mergers & acquisitions), and commodities that hold their value. Look at the rise in value of fine art over the last 6 years. These to me, are signs of a bubble.