All fair enough. But I think there's a disconnect between how concrete you interpret my predictions and categories as, and how solid I actually intend them to be. I don't hold strongly to anything...I just like to take snap-shots and look at historical precedents, because mostly they're useful and give us, at the least, a range of possibilities. Meaning, you look at historic players who are similar in terms of age-contextual accomplishments, and see a range of outcomes.
For example, just about every player was great by the time they were Rune's age. Even the seemingly "late-blooming" Lendl was still a couple years from winning a Slam, but was a great player. His 1982 is one of the greatest Slamless years in Open Era history (15 titles, including the Tour Finals, WCT, and three Masters equivalencies). All the other 6+ Slam winners had won Slams by Rune's age, and multiple big titles.
This is not to say that Rune can't buck the curve. I mean, Stan Wawrinka sort of opened the door for players to have late breakthroughs or do unusual things, as far as historical precedents are concerned. But when projecting into the future, the historical precedents are generally more predictive. With Rune, at this point the precedents say that he's not going to be an all-time great, though still could be a "non-great elite," or nearly-great player.
Anyhow, I do think Rune has another octave in him and is definitely on my short list of likely Slam winner, and possible multi-Slam winner. But he's definitely slipped over the last two years, as far as his upside: from possible all-time great to likely lesser elite. Nothing wrong with that, of course, but just a bit of a reality check compared to what he projected as after winning a Masters at 19.
As for Fils, I'm not sure what you're specifically talking about. I guess my view that he's more of a future second tier type than an elite? You know I like to use Berdych and Tsonga as the quintessential "second tier" types - guys that are regulars in the top 10, might win a Masters or three, but only dip into the top 5 and are never real candidates for #1. I suppose the current equivalent would be someone like Rublev: not quite as good as "non-great elites" like Medvedev and Zverev, but better than guys like Hurkacz and Fritz. That's sort of how I see Fils. Again, nothing wrong with that.