A filter designed to wash out and lower the contrast in a photo, by design, is going to wash out the colors and lower the contrast in the photo. Might I suggest not using a filter designed to wash out and lower contrast if your desire is to avoid washing out the color and lowering contrast?
Changing the filter to not wash out and lower contrast would change the filter to a different filter. Effectively removing the original filter and replacing it with a new one.
While I understand the issue here - I don't see the problem. Use a filter that isn't designed to wash out a photo and lower contrast if you desire a photo with higher contrasts.
It's similar to complaining a warming filter is making your skin too red and you'd prefer your skin to have more of a blue hue. Instead of complaining about the warming filter, why not use a cooling filter?
Changing the filter to not wash out and lower contrast would change the filter to a different filter. Effectively removing the original filter and replacing it with a new one.
While I understand the issue here - I don't see the problem. Use a filter that isn't designed to wash out a photo and lower contrast if you desire a photo with higher contrasts.
It's similar to complaining a warming filter is making your skin too red and you'd prefer your skin to have more of a blue hue. Instead of complaining about the warming filter, why not use a cooling filter?