It is ridicilous people expect a backup keeper to be as close as Ederson in term of quality, unless you paid him in large amount like PSG does then forget it.
Same as Zinchenko, the same guy that makes a meaningful contribution last season to bring our club to the final champions league for the first time. At his best, he is the best backup for the squad that we ever got. The moment he plays bad just like last match, people want to get rid of him forgetting how good he is when he play at his best last season. Really shows how some our fans have a literall span of memory of goldfish.
Player will have their moment of up and down, they are only human. You can't expect them to be just as consistently good like that Messi and CR37 in their prime years, that's unrealistic and no player will be close to be consistently good as them all the time in their prime. The only thing we can do is hope and pray that they will be consistently good enough in each and every match, not expect them to be like those two people that i've mentioned above.