I have no problem with changing symbolism in the temple, because what differing cultures and generations take out of symbols changes.
For example, there was a time when ANY member who received the endowment LITERALLY risked life and limb in doing so. They truly were threatened with death for not revealing what occurred in the temple, so the punishments made total sense. It wasn't, "We will kill you in these gruesome ways if you reveal this," but rather, "You must be willing to die in these gruesome ways" - which, again, was a real possibility at the beginning of the Church's existence. As that reality changed, and members stopped being threatened generally in that way, I am glad the symbolic actions were deleted. They no longer rang true AS SYMBOLS, so they lost their symbolic meaning - and actually started being misunderstood.
Washings and annointings are the same: In a day and age where it was no big deal to strip naked and be washed fully as a symbol, such practices made sense; as that became more and more uncomfortable, eliminating the nudity and altering the ordinance to our more recent practice still could hold the power of the symbol without the reticence and discomfort that would have accompanied the former practice; as our society has become almost obsessed with "improper touching", it's only natural to change the specific practice again to continue the underlying symbolism.
Finally, the elimination of the Protestant minister role in the endowment also makes total sense when it is viewed in relation to the opposition that was being faced previously and the changing world in which we now live. What made perfect sense in the former society simply doesn't ring true symbolically any more for many members - and once the tipping point has been reached and a symbol starts being more problematic than positive, it's time to change or eliminate it. (Besides, do you really want to go back to the Nauvoo endowment - the one that lasted all day? I thought not. *grin*)
One of the best things I was told when dealing with symbols is to contemplate the "what" (What is being taught by the symbol?) and the "why" (Why is this particular symbol effective or problematic?). That has helped tremendously in accepting the changes in the temple symbolism I have seen in my lifetime and those that happened before I started attending.