I’m not vegan myself, but if the environmental costs of harvesting milk and honey can be offset by producing them in a lab and the products are safe and cost-effective then I’m all for it.
I do know that there a massive issue with honey fraud. Where honey is being diluted with other substances. That's where I see these lab grown producers being better. You're buying from the supplier, or at least know more about where the honey is coming from. If they can compete on price, then companies no longer need to import honey that comes from some country that let's slide some product that doesn't hold true to it's ingredient list. So for mass market products, I'd imagine we'd get higher quality product.
So while not truly "Vegan", idk how far down that rabbit hole many Vegans will be willing to go down in order to adhere to that standard. (I myself eat >90% vegan).
… or add plain old sugar. Which is what most honey what comes from China (they produce & export a lot of it) contains. They are so good at it now that you can't even tell just by tasting it, you need to do chemical analysis, and there it's easily visible if the honey was stretched with sugar or is all natural.
Domesticated honeybees aren't the best pollinators: https://science.sciencemag.org/content/339/6127/1608 "Overall, wild insects pollinated crops more effectively; an increase in wild insect visitation enhanced fruit set by twice as much as an equivalent increase in honey bee visitation."
Large scale beekeepers are very willing to harvest the entire store of honey, and feed the bees sugar water over the winter to keep them alive.
The act of beekeeping, no matter how gentle and well-intended the beekeeper, involves killing bees. They're non-native to north america, and negatively impact our hundreds of native bee species in ways that we're just beginning to study and understand. They're not exploited on the same level as cows or pigs, and don't have the same environmental impact as factory farming, but it's not a benign industry.
Source: I kept bees for ~6 years
In my country it's very popular for individuals to own bee hives, and I can't remember the last time I bought honey in the supermarket. The quality of the honey, the taste and the texture is completely different. Whenever I only have access to commercial honey (e.g. travelling), it just tastes like sugar syrup to me.
EDIT: I should add that buying locally produced small batch honey is a good thing as it supports beekeepers that actually tend to respect the bees. The big industry stuff however is bad news as is the case with all animal industry in the US.