Garment quality will likely remain consistent. Assortment has been changing, and fit for women only was overhauled in F22. They're keeping a lot of best selling lines, but condensing them, also especially in women's. The Atom SL, LT, and AR became an Atom & Atom Heavyweight. The Alpha and Beta shells dropped the SL, Gore PacLite versions. The 2 versions of the Zeta condensed into the "Beta Jacket" with more casual pockets compared to the usual harness-mindful design of the Alpha and Beta hardshells. That freed up space in their line plans for new products that cater to the Asian market: luxury lifestyle, high quality goose down in more silhouettes, and more insulated ski outerwear (at least for the fall-winter season; very intrigued to see spring-summer launch in a month or two).
I have not noticed any sourcing/quality changes. In fact, any international brand focus is likely to increase quality. The US market is #1 when it comes to buying insane amounts of cheap clothing, wearing it 7-10 times, and feeling charitable when we donate it (even though the vast majority ends up getting trashed). Every other market is less interested in fast fashion and more interested in moderate price points, solid quality/durability, and wears their pieces more often/for longer. As you mentioned, the Chinese supply chain is solid. 50 years is plenty of time to get good at manufacturing. The rest of SE Asia is up there too. Vietnam is where most of my business went when the tariff wars with China picked up. Other SE Asian countries and India are about a step behind. Bangladesh makes a ton of stuff and runs the gamut quality-wise (but can be a hot bed for human rights violations). Africa is newer, and can make a solid garment as long as the seamwork is simple. But source country alone doesn't make for a quality garment. It really comes down to the brand, their ability to find the right manufacturers, willingness to send their sourcing team to make factory visits, tight QA process and either the longstanding partnerships that lead to low defect rates or the willingness & leverage to reject sub-par goods. Those things can go right or wrong in any country.
So looking at the Rush in particular, the easiest dupe is the Patagonia PowSlayer. Both are ski shells made with GoreTex Pro and a nylon ripstop face fabric. The Arc'teryx one uses a higher denier fabric (80D for deadbird, 40D for Patagonia) and weighs a little more, so the fabric will be more durable, but the membrane will likely give up before that becomes an issue. Burton ak Hover Gore Pro is also an 80D nylon (more similar to the Rush). They don't disclose country of origin (only required on the tag, website just legally needs to disclose imported or not). Goretex has a lot of requirements for any brand that licenses their membranes, but Pro is next level. They require 30D+ fabric (minimum used to be 40D) and have testing standards for tear & abrasion resistance.
Now, Gore Pro gets a reputation for being a higher quality membrane because it's a higher price. It is more breathable, but it's higher maintenance. It's only ePTFE vs. traditional Gore using a mix of ePTFE and PU. The polyurethane holds up better against dirt and oils that can degrade ePTFE. If you run really hot or do a lot of uphilling in your shell, Pro is a great option. I'm far from the sweatiest person on the hill, but I've been really pleased with Gore Pro in my all around, general alpine hardshell. But I tend to go for "regular" Goretex where I don't need the breathability because I'm a gross little gremlin who gets a lot of grease and grime on her kit from chairlift grease, brushing up against my bumper, and using my pants as both a plate and a napkin while housing a breakfast burrito on my way to the resort. It also knocks ~$100 off the price (or more if you swap to polyester). Opens up some options like the OR Hemisphere (sewn in Bangladesh), BD Mission, Armada Haydon, Arc'teryx Sabre (sewn in HK), and a few others by Haglofs. Really irks me that Patagonia doesn't have that combo in their assortment.
Hope you find something you like and happy to add comments if there are any other options you're not sure about.