I'd say there's nothing ridiculous in expecting FOSS thing to be as good as non FOSS, both are made by human after all, yes more work is done by paid developers than by enthusiasts, but there's nothing impossible about FOSS software being as good as non FOSS.

What's ridiculous is that people expect one software to behave the same as other software when the FOSS software does not imply in any way that it is a clone of a proprietary software and that it strives to behave the same way / be a direct replacemen. Like, yes, Inkscape is a great vector editor, but noone says it's an Illustrator clone. You can ditch Illustrator and use Inkscape, but it isn't a direct replacement, stuff will be different.

There are "free clones", like double Commander is a clone of Total Commander, and in this case it is valid to expect one to behave exactly like another.