Yes. I have yet to see/find an S/R indicator for any platform that is of significant use.
You're probably right.
I was always told that S/R is an indioviual thing.
Draw a trillion horizontal lines on a chart, ask a dozen trader's where he/she see's the next support, & you generally get a dozen different views.
I use previous % because that's the way I was taught, but they only work in an ideal situation.
I trade three lots, enter on a break of 12.5% (Not shown) or 25&, depending on apparent Vol. & drop one lot at each % break. Stops are 12.5% behind action.
Basic, but works. I think it's better in 'Soft's', which is my background. But it'll do until I get settled in FX.