I think the links should open in the same window (like they do here on HN) instead of in a new tab/window. If I want a separate tab, I can Cmd+click and Browsers don't have the reverse option for opening in the same window.
That's a good user setting, but as opening in the same tab is the default browser behaviour then it should really stay that way. Opening in a new tab takes control away from the user.
In general, it's better not to force an action onto users. You might prefer things opening in a new tab, but you always have that option. If it's forced on users, it is frustrating for those who would prefer that not to happen.
Very cool but I would like to be able to create an account with my mail address instead of using a Mastodon account because I am trying to avoid social media.