Beside this "bag appeal" I've read about for the last ~3 years,
what's the downside to "foxtails";
What people call foxtailing is often just a typical haze or sativa bud structure. I associate it with haze, others who grow landraces and sativas will probably consider it a sativa trait. That structure actually has a higher bag appeal for me (and I think many people here in NL since amnesia) than round indica/kush nuggets.
There are a couple of downsides to foxtailing though. One is that it decreases the trimmability (?) of the bud. Many commercial growers who need to trim a lot, or even use a machine to do so, prefer round nuggets. Personally I don't mind that either, it tends to have a high calyx to leaf ratio so there's less to trim. Besides that, I much rather spend hours on trimming sativa bud than indica nugs considering I smoke it all myself :)
A potential problem is foxtailing at the end, beyond the regular flower time, on top of the regular bud, regardless of it's structure. That is what foxtailing to my knowledge used to mean exclusively. While the main bud is finished and degrading (turning amber) the foxtails contain new clear/cloudy trichs and just keep on stacking new calyxes and pistils on top of it, giving the impression it's not finished yet while the main bud is done (and in my case depending on season increases risk of rot). I've often recommended to harvest and dry the foxtails separately in such a scenario.
I'm actually kind of excited to see that structure in the IH plant as so far the CH crosses lacked 'haze' but, the problem is that it occurs so soon that I suspect it will foxtail badly at the end too. I'll take a fresh pic of her tonight, it's already more obvious.
The classics at sensi show it nicely:
Master Kush, no foxtailing
Skunk#1, not really foxtailing but showing the potential to do so:
Super Skunk, foxtail-ish structure...
Silver Haze. Many would call this foxtailed. Two of those tails dried in a zip, that has the highest bag appeal IMO. No leaf in the bag, just calyx as compact as it gets. Crumbles nicely... reminds me of when I started smoking cannabis and was picking the calyxes from the thai or 'purple' (dutch outdoor strain)... part of the ritual of rolling one.
X-Haze, clearly showing what I call haze bud structure but is common in landraces and sativas too. This one actually shows nicely yet exaggerated how the IH bud is forming too.
Now, if you add one of those parts from the last two pics on top of the bud on the one of the first two pics, you got foxtails. Or when it's on top (or sides...) of the buds in the last two pics and only those still stack pistils/calyxes with fresh stigmas.
The goal with P was to get the combination of all the above, without the foxtails at the end. This P-F1 plant came close enough, the part on the right is the foxtail but not an issue.
Which is from the hazy pheno in the CH, which imo has the perfect bud structure, but did foxtail slightly (bottom left where it's widest), just not in a problematic way
It's when a bud branches out... buds out... I do agree foxtail isn't very fitting...