And IMHO this is fine as long as it's still viable. SE really should embrace the job system's flexibility and push for diversity within the roles. Switching healers for different turns and content helped keep things fresh and I wonder if that's a big part of why so many look back fondly on HW when it was particularly common around 3.2 to 3.3.
In WoW, if my Shaman was obsolete for some piece of content I was probably going to be sitting out for it, in FFXIV, I just click a button and switch to the job that is more suited. Gearing just isn't an issue in the grand scheme of things. FFXI did well with this concept but FFXIV seems terrified of it.