You are absolutely right.
Forex is an ever moving market, it will dhow different trends on different time frames, one has to have its own time frame to follow amd trade on a single time frame.
Above all most of the strategies are built around a bunch of indicators , and let me add, all the indicators are following the price(market) and they merely show a probable direction of the market.
So it is always better to find a bunch of indicators ( lesser the better) for your own style and time frame,and stick to the rules , mainly sl rules , tps one can adjust at will.