After switching over to matching rod and reels, I can tell you, there are very few disadvantages. The overwhelming advantages are that each rod and reel operates the same. So when switching from one bait to another (on different rods), the rod and reel operation doesn't change. This gives you consistency. You eliminate adapting to the idiosyncrasies of different reels. And besides the different rod actions and varying line choices, each handles almost the same. This leads to more consistent casting and better lure presentation.