I don't think you have much to worry about. This seems to happen only to some people with wavy or almost straight hair. If curly people really lost curls from that, I know a dozen who would start doing henna just for that reason only ;-) I have not noticed much difference on my 3C hair either. I do roots every 10-14 days when they are about an inch or so. I have white hair that grows really fast. I do normal henna paste for the roots and just a bit of gloss or a cassiamix for the lengths. They are already at maximum henna saturation. It gives just a bit of extra sheen for the lengths and the roots get the full dye.
I guess it depends on your hair, if you can notice any difference.
/ CMG
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