I just took one of he most traded stocks - AAPL. Please take a look at the chart below
chart courtesy of
http://www.marketvolume.com/
If HFT is main component of volume (more than 80% by your opinion) how you explain strong drop in trading volume on AAPL starting from 2008 until now?
I agree with you that HFT affect the market especially on lower time-frames where every $0.01 makes a difference. On my opinion it is extremely difficult to trade intraday time-frames by making 10 trades a day, as you said a trader in this case is competing with computers that do not use any analysis but see coming orders and are able to paste a contrary order and bit the price and then to place another order to close the position with profit.
I would not agree with you when it comes to higher time-frames. HFT has small or no impact on them