Zelta i think pixel art should be perfect no matter resolution, without addons plugins wahetever.
not adding this to the core version seems a big mistake to me. dont hate me please, just my opinion.
While the thought is nice, it's also important to understand that every single feature added to the core increases the technical debt(potential for bugs and the overhead of code to maintain for an example). So the consideration of 'can this be done as an add-on/plugin instead' certainly does make valid sense too.
Note that there has also been some discussion over having some plugins as officially maintained repository as well. No decision as far as I'm aware yet, but some of them could even be bundled along with the release by default in the future. In that case for the end user, especially if the bundled plugins would be enabled by default it wouldn't be any different in practice from those features being included in core.