The thing is, there are three ways to survive as a company. The one way is establishing a brand like Ecoflow, DJI, Anker, and do what you suggest. The second one is to produce directly for some large Western brand (either as contract manufacturer or ODM). The final way is to just flood the Western markets with cheap garbage and alphabet-soup brands, and make up the lower margins in sales volume. There can't be that many companies making and selling PL259 adapters as there are "brands" on Amazon selling them, after all.
...and because they don't have a presence in the West and don't care about their brand(s), if the shit really were to hit the fan in such a big way that they can't just sit it out, they can simply drop that particular brand, while the remaining heads of the Hydra will be just fine.
In Switzerland if you import dangerous junk and sell it in your store, you are liable. Of course the end consumer can also directly purchase from China as well but then it is their responsibility (Eigenverantwortung).
Customs will also confiscate fake brands and for example radios that violate frequencies rules (unless you can provide documents that you are allowed to operate such a device, ham radio license etc.)
Another:
> Security isn't just a checkbox for us; it's fundamental to our mission.
EDIT: after researching a bit more, it looks like the initial order was from 2023 (https://simpleflying.com/lufthansa-40-boeing-737-max-40-airb...), so "cozying up to Trump" was probably not a factor at the time. Also, I imagine that order being passed around like the proverbial hot potato between all the airlines in Lufthansa group, until it finally landed in Eurowings' lap: "Interested in some brand new state of the art 737 MAXes? No? Why? What do you mean, `You take them if you're so fond of them`? We would, gladly, but we have an all-A320 fleet and would like to keep it that way. Oh, you too, really?".
The 737 was designed using light tables and slide rules, to use low-bypass turbofans and direct controls with avionics only on board to optionally aid the pilots.
The A320 was designed in CAD and using CFD, with full digital fly-by-wire, and designed from the start for high-bypass turbofans.
Both designs have been updated plenty since, but because the basic design is much more modern, the A320 is much more amenable to being updated. There are elements of the 737 design that still exist on every new MAX coming off the line that would completely doom the certification chances of any new design, but are still there because they got grandfathered in for 737.
The wonder is not that the A320 finally caught up in sales, it's that the 737 can still be legally sold.
Not only that, but Boeing is actually limited in how much they can "modernize" the 737, because doing too much might exceed the limits of the 737's type certificate. This is the reason behind the current engine inlet overheating worries, which has led to an airworthiness directive for the 737 MAX (https://aerospacenews.com/faa-airworthiness-directive_boeing...) and is also one of the reasons for the delay certifying the MAX 7 and MAX 10. This would be a complete non-issue for other planes, because all modern designs have a switch position that only turns on the engine anti-ice system when it's needed, but the 737 MAX can't have that because the 1967 737 didn't.