I agree. Long term trading I use yearly, monthly, weekly, daily and two minute charts, those who don't trade long term would be saying that why use yearly or monthly as these charts are lagging. Now we should agree that is takes years to get decent at learning how to trade just about any instrument stocks, ETFs, futures, options, etc... some believe in pure charting, some believe in TA, some a mixture and some throw darts, and overall the percentages to make consistent profits is very low, doesn't matter which way you get to being profitable, so long as you are making more than losing.
Vendors, I believe 99% of them lose money, whether they are selling software, indicators, seminars, chat rooms, courses. Dealing with the public to me is a pain in the ass, cause it draws in those who as on their last $1,000 and think with a little help they will be on their way to millions. If it was that easy, percentages would be higher for successful traders. If the vendors had anything of value, they be hoarding it and trading it themselves. Good traders can reap thousands most days and whatever you can pay them for whatever they selling, they should be able to make on one trade, why sell it for so little monies.
Some folks thinks charts are all they need, but they didn't come to that conclusion after couple weeks of study and back testing, and patterns that charts produce, they don't predict the future but have probabilities based on back testing, same goes with TA-alone they mean little, but they develop patterns and have probabilities based on back testing.
And for day trading, you generally are doing one of two means, reversion to the mean or breakout from the mean. Lagging or slower indicators can give you an idea where price is in relationship to the "mean", whether moving averages, market profile, or swings on a chart. So long as you come out profitable on the day is all that matters.