We specifically state at https://imagej.net/Help that you should prefer the Forum over other channels of communication.
Your Gitter link did not go anywhere, but I am guessing you mean this post about SPIM Registration? Note that SPIM Registration is a Fiji plugin, so imagej/imagej would not be the best room to use. The ImageJ Forum, on the other hand, is consistently the best place to ask for help.
How would you suggest we improve the situation?
There are many advantages. See here for a discussion:
Certainly you are entitled to be grumpy. But grumpy plus constructive would be more helpful to improve the project.