Markets are not constantly changing in any radical way. The small gradual changes that do occur just mean you need to have robustness in the system. Big changes when everything goes upside down do happen but those are usually once per decade (last one way in 2008-9).
I think HFT has pretty radically changed trading in a very insidious, sneak up on you kind of way. A 2008-9 type event, given that you don't lose all you capital in the initial crash, is less scary to me because it's obvious that the world has changed.
HFT makes markets more liquid and more tradable, giving more opportunities to investors. The time of innovation is almost here, trading as we know now will change forever, the Holy grail is here. Everybody will be able to be extremely profitable soon. Prepare yourself for the biggest innovation that will ever come in trading analysis!
Oh no i understood well, i just took the opportunity to make an update regarding the incoming of the indicators this thread is about.
I agree that there is more automated "gamesmanship" (spoofing is one example) and liquidity gaps due to automation. My premise is that if you model longer timeframes, and migrate from scalping to longer holding periods, then the automation-generated turbulence is de minimus. BTW, there was quite a bit of human gamesmanship and liquidity gaps back in the days of floor trading as well.