I hear you, however many would argue that 5 to 10 yrs ago it was actually easier to daytrade compared to today. Many prop trading firms have shut down in the last few years, blaming low volatility and HFTs constantly disrupting trends and adding too much noise.
I personally know of at least 5 successful daytraders who quit in the last few years for the same exact reason. And you will find the same stories online btw. There was a user here by the name of "shorttheworld" who was killing it a few years back and then it all stopped.
And then there is this guy....to me, if this guy quits saying that HFTs are making it impossible, then I take note. I guarantee you that he knows more about daytrading than all the members of this Elite Trader put together:
I saw the video. He made gains, but those gains aren't so significant. I think he is far from success.