For the user a unified implementation means that you receive across all platforms the same features in the same quality at the same time. Which means a big win for linux and macos. Without electron it usually means there is no app at all, or just some cripled half-assed version which is constantly different and bug-ridden.

Even for big companies it's hard to organize multiple projects to be on the same level, especially if we are talking about some more arcane platforms where you have a hard time to find people with enough experience.