Could be lighting a flare in a petroleum refinery on this subject, but...
IMO it's a proven design defect, but whether or not you do anything about it depends on how long you plan to keep the car. If you plan to keep it forever, then you might consider replacing the follower every 10k miles or so. Otherwise, I'd probably suggest not worrying too much about it...
I had mine replaced along with the cam at about 45k miles, and got the dealer to cover it even though there was no CEL or driving problem, based on photographs I took of the follower and cam lobe, and a letter I wrote. That ended up resulting in more trouble than it's worth, since the cam replacement wasn't done correctly and since then I've been battling oil leaks and engine damage, most recently leading to another cam replacement + HPFP, rocker arm, valves, etc - car's in the shop right now as I write this.
So basically if you plan to replace it, replace it often so you don't have to deal with a cam/HPFP replacement as well. Or, just drive the crap out of the car and don't worry about it, and if you have a real problem with it, have the dealer replace whatever blew up when it happens, if that happens before you sell the car.
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