Maybe they meant for Custom Lineage to also work more like Custom Subrace or Variant
Race?
If that was the intent, then I would be fine with someone playing a Variant Elf or whatever. After all, compare Human to Variant Human:
Human:
Variant Human:
Instead of gaining another 4 ASI +1s, you gain a Skill and a Feat. But, Variant Humans are still Humans.
A Variant Elf would give up
Darkvision (maybe), Keen Senses, Fey Ancestry, Trance, and Elvish for a
Feat and choice of Darkvision or a Skill.
I think WotC could have made the intent clearer by calling this Variant Lineage instead of Custom, and included that you can use the process as well to create a
new race as well?
EDIT: I am
still not happy about the option to make a race that has both a FEAT and DARKVISION because IMO and IME they are two
very powerful things in the game. Variant Humans don't have Darkvision after all, but with Custom Lineage, you could still be a new Variant Human with both. I do NOT like that... too over-powered. The Custom Option should have been a FEAT
or Darkvision and a Skill IMO. So, in that respect, I would still not use Custom Lineage as written.