That's fair, that would explain why nobody replied to me when I mentioned that.
I might be remembering conversations I've seen on other forms where it has been said to be a balance consideration, which has always felt strange to me.
In particular, with the now errata'd oddities of Kobold and Orcs being the only races / ancestories in 5e to have negative scores. Whatever about Orcs being basically locked out of being Wizards, Kobolds -2 to Strength, while naughty word for Barbarians, doesn't stop them being great in a team with at-least two melee or close-range members and being absolutely ridiculous in any campaign that takes place in areas without a lot of light. Those negatives really didn't balance out the abilities of those two at all, and were clearly a leftover from previous editions.
I admit I am jumping in at points and this has gotten very long and circular. I hope I'm providing some new original thoughts.
As an aside, this thing has inspired me to consider making an all Aarakocra / base flying speed ancestory campaign (with Floating ASIs, though players don't have to use them), which does balance the ancestory out by... forcing every PC to be one... and creating a homebrew adventure (and probably fairly homebrew setting) to revolve around flying...
... I promise to ensure there are some land bound melee enemies in that one.