I don't think that's the issue, because the one thing we know for certain is that if even a smallish but vociferous number of those who have actually bought an 8GB system recently were to feed back these kind of complaints, based on genuine performance issues rather than hyperbolic conjecture, Apple would have no choice but do something about it.
What they know is that those complaining are predominantly not customers, and their complaints might be valid in isolation, but that couching them in terms of '8GB is no use for anything but a bit of web browsing and some email' or that 'most users have problems' isn't even slightly true. On the basis of their engineering, development process, testing, macOS and software roadmap, they know these systems are good for the large segment of the market for whom they are designed, and that they'll remain so for the years they need to.
They are certainly into profit as a motivator, and in the economic climate we exist in, investor-driven and controlled as it is, they really have to be whether we like it or not. What they are not, and never have been interested in, is catering to the high volume/low cost market. They can't compete with the likes of Asus, Acer, Dell, HP etc, and the rise of the knock-off Chinese off-brands that occupy that area of he market, so they simply don't want to try. It would be financially ruinous of them to attempt to out-Chuwi Chuwi as just one example. And since that market it well served by Asus, Acer, Dell, HP, and even Chuwi, those that complain they can't get a Mac for the price of a knock-off or have to pay a bit more for upgrades have plenty of choice.
This would be true if it weren't for the fact that (as above) that isn't at all the market they're aiming their products at.
The world is full of premium brands that deliberately avoid any attempt at competing for 'price sensitive' customers, and the only thing that might upset these businesses is a global recession. Even then there's still plenty of liquidity in the market for most to sell their products into.