Parameters are that 50 points at 19 and 20 years old when you’re 6’3, 220+ pounds is extremely impressive. You can figure formulas to see what that equates to in his mid-20s using a typical historical development curve. To me, that’s much more impressive than Demidov or another skilled forward getting 65 points at 19 or 20.
How many 19 and 20 year olds get stapled to the top line through thick or thin? How many get first unit PP time for a full season despite producing as the 12th best PPpt/PP TOI rate?
Looking at point totals gives an incomplete picture -- it's like you want to lower the bar so Slaf gets in and then you can say "look, Slaf is extremely impressive!"
I don't like looking at point totals because it lacks necessary context. Why else do you think I was inquiring about his Liiga point totals? It didn't make sense to me why a top ranked prospect (who would go on to be 1st in his whole cohort) would have only 10pts in 31gp while Kotkaniemi and others at his age had better production. No one had a satisfactory answer to the underlying question: was he inconsistent, was he snake-bitten, did he play with scrubs, etc. It wasn't about his points, it was about how he got there.
This past season was not particularly good for Slaf. Not just Slaf himself but even on HF some of his biggest supporters (and some of "my biggest opponents") begrudgingly or otherwise agree with the statement: his past season was underwhelming. But sometimes these discussions are like whackamole, you guys say different things and are at odds with each other's statements but the only thing uniting you is your opposition to the big, bad, evil Slaf Detractors. You guys rarely disagree with each other even though your statements are sometimes at complete odds.
For a generic 20 year old, a 50 pt NHL season might be good, it might be great. Slaf is not a generic 20 year old: he's a 1st overall playing on the top line, he's not just physically massive he's also quick and spry, he is given TONS of PP time. Slaf had fewer goals, fewer SoG, and less TOI in his 20 year old season than in his 19 year old season (one where he was bad for half of it). Trajectory matters: a 50 pt season might be good but if it follows a 70pt season it is not good. Slaf's 20 year old season was worse than the half of his 19 year old season.
This is all good and fine and part of non-linear development and nothing to get hung up on but it isn't reflected in your general comment "50 points at 19 and 20 years old when you’re 6’3, 220+ pounds is extremely impressive".