The trash can looks quite outdated
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This is the current trash can icon in Adwaita:
And when "filled":
These icons look a little like they came out in the 2000s. They also look quite realistic. This is in contrast with newer guidelines for app design / the Adwaita icon theme refresh.
Thus, the trash can icons should be updated according to the new design principles.
Some examples from other popular icon themes (not a proposed solution, but food for thought):
Papirus:
Cupertino:
Cupertino (filled):