As I said before women and men need not be so called "equals" everywhere. In fact both are different- biologically, physically, mentally, hormonally etc etc. Having said that, women most of the time are more religious than men and do not need any other formal encouraging like wearing tilaks- in my opinion.
For women, fulfilling their Dharmas alone are said to grant liberation. But, it is not so for men. MAY be this is the basis; I can only guess.
Each and every master who established a sect came with their own marks and rules. They only know why. Just as Shaivas have different mark from Vaishnavas, the Gaudiya Vaishnava has different tradition than others. It does not mean anything else in my opinion- certainly a Shaiva woman can attain moksha without any marks onher head. There are tyaagi women saints who have contributed to the Vedas.
I guess that is what makes Gaudiya Vaishnavism different than any other Dharma - moksha is part of karma-kanda, which is not to be focused on. Yes, it does say that a woman can receive moksha by fulfilling her Dharma - pati-dharma... however, it only awards liberation, or moksha, and can not alone grant bhakti to that woman.
I know what tilaka stands for... I wear it every day on the twelve parts of my body, whether with Gopi-chandan or with water only, but I do wear tilaka. I guess my contention is that I am trying to put a Western spin on a tradition that only sees that a woman's Dharma is pati-dharma: to worship her husband as her guru and god, and that alone is necessary, a tradition where only men can be gurus and can not continue disciplic lineages in the sampradayas.
While women and men are different physiologically, I am speaking of the spiritual, which only applies to the soul and not to the body. If we are to focus on spiritual life, it is this attitude that women must sit behind men that gets to me.
I am not a feminist; actually, I am anti-feminist *personally*, and also have been diagnosed with gender identity disorder - so my thoughts, feelings and neurological capacities work as if I were a woman mentally. I look to Sita-devi, Draupadi, Queen Kunti, and Bahinabai for inspiration.