This is, pardon, demagoguery. There is always "future fun" and "present fun" which a normal person would assign different nonzero weights (https://en.wikipedia.org/wiki/Discounted_utility). Besides, building a LLM _truly_ from the scratch, just using the famous 2017 paper and numpy manuals is not fun at all, esp. for a high schooler.
To you it isn't, is my entire point here. But why extrapolate what you think is fun, to others? Sure, I don't find that fun either (although useful), but who am I to say it isn't fun for others?
Yeah, if you see it as pointless, then I prefer not to. Have a enjoyable day!