Awareness: Because your wish or suggestion isn't implemented doesn't mean it was ignored.
I have also been playing since the 10-Day Pre-Trial of DDO without a break of no more than 30-days. I know that from the Turbine days to SSG lag has been a point of discussion and has at several points been addressed. This is in my opinion is a great message from our game owners/developers and I appreciate it.
To counter your demand that lag be addressed to whatever level that would appeal to you or it is being ignored. At the same time and at really any other time I and many players generally always advocate for more content and I still do. So from my perspective my requests to continually add content was not ignored.
I think with server reboots, patches and when needed even more advance bug fixes SSG as demonstrated they are aware of problems and try to address them. Some of them take longer than others.
Content drives player satisfaction or SSG can chew gum and walk at the same time. The bottom line lag affects me at times as well but to me it has not been at a level where I just don't want to play DDO or provide flaming mis-quotes on current or previous DDO staff. I love DDO and believe that the state of the game is doing great.