Milwaukee can't make a drill chuck that actually holds drill bits. If they can't figure that out no way I trust them to make a entire tool.
Milwaukee doesn’t make their own drill chucks, just like most other drill manufacturers.
Most of the keyless drill chucks, and possibly the keyed drill chucks as well, used on Milwaukee drills are manufactured by Yukiwa Seiko. Yukiwa has been supplying Milwaukee with drill chucks since at least the first all metal keyless drill chucks Milwaukee supplied on their drills. I’m not sure, but this might go back to the 1980s or early 1990s.
Yukiwa Seiko also supplies drill chucks to other manufacturers as well, including Makita, and judging by an image on their website, Hitachi, and some Dewalt drills.
Back when the cordless Milwaukee drills were being made in Europe, either Germany or the Czech Republic, the Japanese made, all steel Yukiwa Chucks were probably some of the nicest drill chucks that came on cordless tools.
However before that, Yukowa seems to have supplied an all steel keyless drill chuck, that seemed to be milled from bar stock like older keyed chucks, and I believe I saw it referenced years ago that these had “issues” and didn’t work very well. Yukiwa also likely manufactures the ‘Makita 763198-1 Keyless Chuck’, the hex shanked keyless chuck adapter that Makita sells for Impact drivers, snd these seem to have a number of negative reviews as well. Yukiwa also used to manufacture an all steel keyless chuck that looked exactly like the chucks used on the German Milwaukee drills, but which didn’t ratchet, and these also lacked in performance.
The current Makita drills use Yukiwa chucks, and other than the Impact adapter keyless chuck, I don’t recall seeing many complaints.
I’m not sure what the issue is, but it seems that Yukiwa is inconsistent with their chuck designs or manufacturing, and while sometimes the chuck designs are close to perfect, other times they just ****. The difference between the Makita and Milwaukee performance just seems odd, unless Yukiwa tests the chicks, and gives Makita the good ones, or Milwaukee pays them less, so shortcuts are taken with the manufacture.
I forget offhand whether the current Milwaukee drills use a standard threaded arbor. If they do, Rohm in Germany manufactures a line of chucks called the Supra SK that are very good. These were the chucks used on some of Dewalts top of the line cordless drills at one point, and also the chucks Fein uses on their drills. Alternately, Metabo actually manufactures a lighter weight, all steel drill chuck, that is used on a large number of European brand cordless tools, and these tend to be very good as well.