I hope everything isn't up for grabs when designing a lineage, but more along the lines of "culture" vs "ancestry", where cultural features are swappable/blank-fillable, but ancestry isn't. Similar to a couple of supplements on the DMs Guild.
I mean, only dragonborn should have dragon breath weapons. But a High Elf might not learn any elven weapons, or skip learning a cantrip, or not even learn Elvish, in favor of some other cultural features from another lineage. But they'd always have Darkvision and Fey Ancestry, as they're physically (or magically) inherent traits.
While Attribute Increases could fall under either, I'm almost certain they're just going to open that up to adding +2, +1 where you like. Which is fine. I think it opens up a lot of interesting choices, as players will no longer have to worry about selecting a "sub-optimal" race/class combination. They can play the character they envision without feeling they've shorted themselves somehow.