Thater, Plisson, Shavemac, the 3 Germans we carry (Dovo, Leonhardy, our house brand), all make them by hand.
There's exceptions to most any rules, but I do think you hear less of these other EU hand-produced folks' problems mainly because of influences of all four that follow, ordered in my suspected factor of influence on public perception
1) they sell much less
2) they're not setting the knots as deeply - easier to gauge what's going on and be sure of the setting when bored more shallow but then the knot moves about more under load
3) they're not stuffing the knots as densely, so the glue can take up more of that space in that bore hole
4) they're trimming down the bore-hole end of the hair more to get a more unified base position (better hair's longer hair by and large, and thus the CH3s, PL12s, Kent BK/BLK12s, Leonhardy 700050s, Shavemac 177s, etc. obviously have the very best of hairs to be that long in the first place, and thus can't be trimmed much nor have much room to hide in the ability to get those knot bases well aligned).
In the end, handmade brushes are cool and always a bit problematic; you can't have their good without their recurring bad. Like Frommer's said of cycling in Dehi as a tourist, "pedal if you dare".