I think this is too much of a generalization. Certain discussions even benefit from a certain amount of shielding from the outside world. I think there are mechanics working both ways, and to generally equate local feeds with reduced discussion quality is a poor argument.

I'm not saying Local feed in general, but showing users the Local feed first. Because I'm speaking about the average user, who will usually go with the default settings. Then this user will only see content of their instance and that's bad.

Also, how would the addition of another feed (read: the selectable option for another feed) change anything about that? Instance owners who “push users” to their Local feed (as you unecessarily dramatize it) could still choose Local as their default, even if you requested new feed was implemented. In both scenarios (with and without the new feed), users can freely select another feed anytime (because no one actually pushes them), or even define one permanently in their settings, overriding whatever default the instance owner had selected.

I'm always speaking about the average user. Not even the average Lemmy-User currently but let's say: non-nerdy users that will be more present in the future. They don't tinker with settings and maybe switch instances if they don't like their experience. Choosing default settings is therefore important.

The new feed would do nothing about the situation but give instance owners another option to “push users”, and users another option to select from.

Every admin has the motivation for their instance to survive. They need to have some handle to ensure that. As long as it is transparent and applies to basic rules I'm fine with it. The rest is handled by federation.