I think Brigette is healthy for a format that has become evolution-heavy. There's only one deck that I feel slightly abuses Brigette, which is Tapu Bulu GX/Vikavolt. Being able to grab a Tapu Bulu GX AND two Grubbin makes it that much easier to get a Turn 2 Vikavolt, which puts your opponent in a bad position at the beginning of the game. With that said, I don't think Brigette should be changed. Most decks don't grab any GXs with it. Gardevoir grabs Ralts/Remoraid, Metagross grabs, Beldum/Alolan Vulpix, Volcanion doesn't use it. Drampa GX/Garbodor is another deck that slightly abuses it, being able to grab a Drampa GX and two Trubbish, making it much easier to get a Turn 2 Garbotoxin active and/or utilize Po Town for a 150-180 damage Berserk. I don't think it's enough to warrant an errata though.
It'll be interesting to see how much of an edge, if any, Brigette gives decks that are focused on running Ultra Beasts because now players will be grabbing 2-3 GXs with Brigette. Sure, just because they're on the field doesn't mean they pose an immediate threat, but getting them on the bench Turn 1 does give you the advantage of helping thin your deck a bit and focusing on powering them up as opposed to having to use Ultra Ball, Nest Ball, or whatever other search options are available to get them on the field.