Some people have huge FPS problems so it definitely does need to be fixed. Fortunately, the director has stated that game optimization is a priority and is being worked on. So it’s not being ignored or anything by any means, it’s being worked on. Personally, I consistantly get ~120 fps in most areas, with busy towns dipping into the 40s. It’s not perfect at all times but does pretty well for me.
That said, people who optimize code are not people who develop or adjust content, so there’s other things they should be doing simultaneously. The FPS problem requires an overhaul of the client’s code base. It’s going to take some time.