You can't polish a turd. There would've been no point in modifying the engine a bunch if you hadn't given them a useful base to work with.
phoboslab was downplaying their own efforts by saying that the Cross Code team customised the Impact engine a bunch. My point was that no amount of customisation can turn a bad engine into a good one (you can't polish a turd), so phoboslab definitely deserves credit for building the base engine for Cross Code.
At a risk of being off-topic and not contributing much to this particular conversation (as I doubt it's relevant to the point you're making), I'd like to note that I often actually find it preferable to "polish a turd" than to start from scratch. It's just much easier for my mind to start putting something that already exists into shape than to stop staring at a blank screen, and in turn it can save me a lot of time even if what I end up with is basically a ship of Theseus. Something something ADHD, I guess.
However, I'm perfectly aware this approach makes little sense anywhere you have to fight to justify the need to get rid of stuff that already "works" to your higher-ups ;)
Of course you can. Not really sure why this still is tossed about. You just get a shiny turd with a lot less stink. I've made a career of taking people's turds and turning them into things they can now monetize (think old shitty video tape content prepped to be monetized with streaming).
You didn't polish a turd, you found something that could be valuable to someone and found a way to make it into a polished product, which is great.
But "You can't polish a turd" implies it's actually a turd and there's nothing valuable to be found or the necessary quality thresholds can't be met.
You absolutely can. Mythbusters proved it.
