Rinse out and leave in conditioners contain many of the same ingredients, sometimes rinse out are thicker/ richer. Companies prefer you to use rinse outs because you use more, waste more and buy more.
Assuming the product is CG friendly no specific ingredients should not be left in your hair they are all fine. The amount you use depends on your hair type and the specific product, use enough to start clumping and get a squishy 'seaweedy' noise.
2a-2c, medium texture, porous/ colour treated. Three years CG, growing out mechanical and chemical damage = breakage and very high porosity. Past armpit length heading for waist.
CO-wash: Inecto coconut
Treatments: Komaza Matani, coconut oil, Hairveda Sitrinillah
Leave in: Fructis Sleek & Shine (old), Gliss ultimate volume, Inecto argan
Styler: Umberto Giannini jelly, Boots Essentials gel
Experimenting with: going back to basics