Yes and no. On the one hand, fixing those processes is a much bigger impact, you're 100% correct. But on the other hand, I as an individual can do exactly nothing to affect it. While my personal environmental impact is much smaller, I actually can control it. So both are valuable to think about in different ways.
Or do both? No one is telling you not to buy something you will use, but the OP was commenting about boards they purchased and never or rarely used. Being slightly more considerate about your use is free, and if more people do it, maybe it will move the needle a point or two.