You only watch GT's and spring classics?
You are missing out. Big time. He doesn't win in a way that has been considered the norm the past 30 years. That raid in Germany would have been the coolest thing had the peloton not been paced by camera bikes in the last 20k. He went from 105k from the finish, lol. The pace in the peloton was so high that Ackermann and Alaphilippe got blown out the back. They caught him with 7k to go.
Head over to TIZ/youtube when you've got some time or are feeling bored and watch San Sebastian (final 30k), stage (4 i think) in Adriatica Ionica (final 30k), stage 3 and 5 of Burgos (final 10k), stage 4 of Pologne (final 53k), ECC ITT, WC ITT, hell, he even made Hammer Limburg entertaining.
I get what you mean, but there is a difference between hyping what has been proven, by achieved results or strong efforts on one hand, and on the other extrapolating that by assumption into an area of wishful thinking or speculation. For me personally, there is a big difference. It's why you won't see me claiming he's going to boss the Giro. It's why i'm not assuming Pogacar to be on the podium of the TDF, or that van der Poel will do to road classics (or cycling in general) what he did to cyclocross.
Also, to compare it with the backlash van der Poel is already getting in moderate amounts, Mathieu also didn't "fail" in San Remo, he was sprinting for 3rd and finished at the back of the group with a lot of big names. At this moment, "not winning" for Evenepoel will be enough for some people to play the "see, i told you so" card, or for others (who expected more) to start sulking and badmouthing him because he didn't live up to their (insane?) expectations.
Personally, i just think he's shown enough already do be raving about, even if he never wins a GT (which i don't expect will happen, but i refuse to take it for granted). I find it hard to imagine him not taking at least a stagewin in the Giro, based on what we know, but i could totally see him crack in one or two stages and drop out of the top 10, hell even top 20. Not expecting that, but not ruling it out either.