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Strade Bianchi is half the race Lombardy is, so please let's not over elevate it. From a one day perspective there are six races that a rider's career is judged on; the five monuments and the world championsip road race.
And, as @snoops says, the prestige of a palmares is very much dependent on the type of rider they are. Van der Poel has a much more storied palmares than Van Aert, despite the latter being a much more rounded rider, because he has won three of the five monuments and the worlds.
What’s the official forum ranking of the top cycling events from a rider status perspective?
TDF
World Championship
Giro
RVV
Roubaix
Olympic road race
Vuelta
Milan San Remo
LBL
Strada Bianci
Il Lombardi
Tdf stage win
Giro stage
Spring classic (various)
Vuelta stage
?