Apple is one of the worst offenders. Tiger fitted on four CDs. Now macOS clocks in at, what? 15GB or more? A lot of what gets shovelled into it could be left to third parties. An operating system should just allow you to install and run the applications you choose and keep out of your way.
A Mac is not just a computer that is able to be used with Mac OS X ... a Mac is a all-in-one-package, a bundle, which is meant to be useful from the start. A PC is just a computer ... well ... mostly bundled with that OS nobody really wants but everybody is hostage to it. But the OS - if pre-installed or bought separately - is not part of the computer, it comes from somewhere else.
A Mac always has been following more the philosophy of a mobile phone like early Nokia models, where hard- and software worked seamlessly together. Or a gaming-console like the Gameboy which came with Tetris bundled - you could start playing a very nice game right from the start. Or the Atari XEGS, which came with Missile Command on-board. May be a Mac can be compared with any other electronic product like a radio or an iron: you plug it in and it works. Such a device cannot come with an Operating System only that leaves space for third-party-apps only.
I mean, yes it is true, an OS shouldn't be bloated that way. I mean even a 20 years old computer is so insanely fast, human cannot realize how fast they are ... it is a bit like humans cannot realize universal distances which become just large numbers but without any meaning to us. An d the amount of RAM and storage we got today, incredible many pages of paper could be stored there. But somehow this all is not enough to satisfy today's Operating System. Following the rule of Moors Law, after 20 years the computer should be 2 to the power of 20 times faster than 20 years ago, if speed double each year, todays computers should be a billion times faster today (well not really but in theory) ... but still, they slow down with every major OS update.
ok, back to the mac: I quite like all devices with the name "MacBook", that starts with my very first Apple device, a MacBook1,1 from 2006 (that very device which I am typing on right now), I got all models of the A1181, I got the 2008 MacBook which became the MBPro 13" (the higher end model with the HQ screen, the backlit keyboard), I got the A1342 (which btw is the working order of a 4 cylinder inline engine), and I got and quite like the MacBook7,1 from 2017. I think this is a very nice device. But the keyboard is terrible compared to all the other MacBook models. Also the Arrow-Down-key is hanging, but still working. On the other hand, the 12" design is pretty cool, it's a good successor to the 12" iBook, or 12" PowerBook G4.
A cheap Mac? Well, as much as I remember, the MacMini once used to be the most affordable Mac with the lowest price tag yet at like 699€ or so ... but I might recall that number incorrectly. I know that the price tag of the white MacBook (5,2 or 6,1 or 7,1) dropped down to 899$ (but still 999€ in Germany). So a MacBook at 799 or 699 or even less indeed would be something new to Apple for a mobile computer IMO.