Explain to me how you achieved 6GB per channel on that laptop. If you "can't do 16GB" that just means you have a single SODIMM slot, which you never bothered to clarify. That just makes the situation worse. I was trying to be polite before but you're being obstinate. Dual channel memory operation requires both channels to have the same amount of memory. Period. Sorry, that's reality - ask around if you don't believe me.
Hybrid drives are just not that good. I barely used any storage on them, and I kept my mechanical drives defragmented. The newer Firecudas are OK but again, outside of the cache they're just HDDs. Compared to a decent SSD they are just slow - especially a good PCIe M.2 drive with a fast CPU to decompress data at the same pace. For hybrid drives, load times in more demanding games is pretty terrible. More so if you play more than one title on a regular basis. eSports games like Overwatch are not too bad, I guess, especially if that's all you play (the cache gets more opportunity to do it's thing if you're always loading the same data). If you don't believe me there's plenty of benchmarks. If it's what you're used to, you wouldn't notice. For me, mechanical drives are unbearable for anything outside of mass storage.
Regarding the integrated graphics: Not sure what you're reading but I specifically said NEITHER of those was a powerhouse. But it offers more gaming performance within that power envelope than any Intel chip remotely in that price bracket. Maybe regardless of price, at the 12W-15W range. A 2700U/3700U would have been even better, but that aside: The 2500U beats the stuffing out of the 7Y30 in gaming. Even in the worst possible configuration (12W plus gimped cooling) running the most out-of-date OEM-approved drivers, it's far better than a m3 with a 615. Again if you don't believe me there's tons of data. For a more fair comparison: it's also generally much faster even against Intel's bigger UHD 620 in their higher-power "U" series chips in gaming performance. Just because they both "run at 720p" doesn't mean anything, all things equal the 2500U will enable better settings or higher framerate (or a mix of both). If you want to operate off opinion then there's no point in continuing... the facts won't change because you will it.