DislikedWhat I highlighted above is why people talk so much about repainting- Not only can you not do a proper backtest, any backtesting you do is meaningless, if you're simply looking at the chart.
That is not true of indicators that do not change state after the close of the bar.Ignored
mtf ind. usually "stretched" to time on lower TF for user convenience, providing user knows (understands): 3(6) bars wide section on 5 min chart - shows one bar on 15(30) min chart
or same thing - you can open 3 charts on 3 TFs and watch just one bar changing on each TF
on backtesting of all indicators (mtf or not) we can see only closing bar ind. value- no data where it was in-between (same as if we could see only price line, not price bars (HiLoOpClose a bit different than close-close) that's why often people waiting on bar close to validate signal
hope it'll help