I see.
Honestly, I don't feel like the SLC is much of an issue given that it still manages to sustain 1GBps post it. Imho it's only an issue for drives that throttle (well) below SATA speeds, which are increasingly rare these days (and/or QLC scams, but you wouldn't want to purchase those to begin with for usually multiple reasons). The amount of people for whom this performance matter you can probably count on a hand, and generally are those who are knowledgeable and will purchase something suitable for their needs accordingly.
Kinda feel the same about the DRAM; yes it is a cost-cutting measure obv but as long as it doesn't hamstring the performance (which it evidently doesn't), I'm perfectly fine with it. A sensible, price conscious product will have to cut corners at some point. It's all about making the worthwhile tradeoffs that don't sacrifice too much performance while keeping costs down.
And as we can see from the test results, these corners are all well-cut in the sense that they're done in such a way that the drive still performs well in most usage scenarios.
I can see your point about the warranty, but honestly I feel like 3 years is aplenty, especially considering that longer warranties usually incur higher costs which are all passed down to the customer in one way or another.
