Lemmy faces the same expectations problems as every free/libre software
It's the same as with Linux, GIMP, LibreOffice or OnlyOffice. Some people are so used to their routines that they expect everything to work the same and get easily pissed when not.
Yeah, its human nature. Things get better and people come around eventually. Kde plasma is way more continuous from windows 10 then windows 11 is anyway.
Yes and no, it's mean that the creativity and innovation of people at KDE is taken without credit. But on the other hand it shows that their features are really great...
BTW they not only copied ideas but also KDE Plasma's slogan "Simple by default, powerful when needed."