[link edited, original one led to a security warning]
Interesting article actually. I think most "degen" altcoins follow this pattern because of the particular economics of premined coins. Their team tries too hard to capitalize on an early hype (often highlighting some minor "innovations") and then proceeds to cash out, entering a "death cycle" where development activity decreases each year, and then simply halts.
Namecoin, which is mentioned in this article as an example, could have been affected by a similar effect: while it's not premined, the team relied on a single use case (name registering) and there were unrealistic expectations associated with this use case. I think however Namecoin is an example of a coin that could turn into an Oscillator again, just because there is no centralized team managing it and because it's an all-purpose blockchain with other interesting use cases too.
In my mind, buying Ethereum is more like paying for an API to use its services, for example creating a shitcoin on the Ethereum blockchain using ERC20. You need to pay fees for that, which are paid in ETH.
In my opinion, in that aspect Bitcoin and Ethereum do actually have some similarities. Bitcoin can also be described as an utility token, only that its purpose is not to host "contracts" (or tokens) but to transfer "value" (of any kind) globally. The "social network theory" (e.g. Metcalfe Effect) applies to both: the more people using it and the denser the network of users is, the more value it can accrue.
I think the main differences between BTC and ETH are more related to their power structure, which was already discussed a lot in this thread. The consequence of its more centralized structure is that the expectation around the developers' and Foundation's work is a more important part of the value theory.
An example: On Bitcoin, software updates are barely noticed by investors, even if their technology is outstanding. On Ethereum, as on many other centralized altcoins, investors actively try to create hype around updates and the new features they bring. This is a bit more similar to stocks, where the value also depends on the company's work. And it's also an indication that Ethereum works a lot more like a traditional security than Bitcoin.