IIRC they reused some of the "arsenal of death" VFX in some early season scenes. They did a lot of volley firing in early TNG, ranging from Yesterday's Enterprise to Best of Both Worlds. It seems like the emphasis changed a bit between seasons and shows as they went from a focus on relative static ships firing lots of things at once, to high speed maneuvering plus relatively low rates of fire. There's probably stylistic reasons for it, as well as the slow move toward CGI. Doing big battle scenes with too much VFX makes the scene look excessively busy, too, which might have something to do with the lack of it.