Do you find Knuth’s books ugly and hard to read?
Computer Modern is bearable in print (although there are many better-designed options from commercial font designers if you want a good 18th century style Didone face).
The problem is that most documents set in Computer Modern are not read on paper but on screens, where its legibility is very poor due to the extreme contrast between stroke widths.
The spindly nature of Computer Modern that you see on computer screens is because of a poor translation of Knuth's Computer Modern design (whose default parameters were tuned taking into account the amount by which ink spreads on the page, on the printing devices Knuth was targeting) into outline fonts (which do not take into account the fact that there's no ink spread on the screen). See for example https://tex.stackexchange.com/a/361722/48
However it effectively communicates "I'm a serious expert in this computer stuff and you won't understand this text anyway", which is why blockchain ICO fraudsters write their zero-content whitepapers in Word but change the font to Computer Modern.