that's not going to change.
None of those BYD models are premium. How can you be premium and sell for under 200k RMB?
For what they are getting priced at, D100 is entirely competitive with SD8155 platform, which is the typical infotainment SoC used by most competitors at this price range.
again, if you want to spend more money, you will get better infotainment system. If you do not, you will get worse infotainment system. There is absolutely not reason any automaker cannot continue to upgrade their infotainment system on older platforms while maintaining similar memory footprint. You can absolutely have builds intended for different infotainment hardware. In fact, it is normal to do so.
Again, here is Antutu ranking from 2024/8, cockpit computation platforms don't change that much. 128GB SDD is for the top end stuff and 64GB is quite common for the medium ranged stuff. 256 GB is rare.
If you are buying Song ultra (151.9 to 179.9k RMB), this is not exactly a price range for high end hardware.
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if you think this is not enough for you, don't buy BYD. Stop wasting time complaining on SDF.
I have a 2022 model y and never cared about its infotainment space, ever. As long as it can get me from point A to point B comfortably, I have no complaints.