Of course, it's everyone's own decision what they do with their free time and it is not my place to judge anyone, but you could at least give a good idea a chance, right?
That's why I suggested to combine communities together. Although PieFed already does that. Movies & TV seems quite active, and offers the best of both worlds not having to search for communities and also if someone is interested in seeing still more of a certain type of post then they can subscribe to the actual community - rather than the Feed - and see those in their Subscribed section.
No we wouldn't fault them for leaving for that reason, but seeing how empty Lemmy can be (a fault that PieFed does not really suffer from, at least nowhere nearly to the same degree) is a different reason altogether than "it's too complicated".