I personally miss reading manuals (or at least skimming them if they're big) before playing games. I guess it feels too much like study/work for it to have a market nowadays; last physical games I've bought had basically the same info as in-game help.
I recommend this site[0] for all those who want to go down memory lane. Just look at this[1] or that of TFA[2].
[0] https://www.gamesdatabase.org/all_manuals
[1] https://www.gamesdatabase.org/Media/SYSTEM/Commodore_64//Man...
[2] https://www.gamesdatabase.org/Media/SYSTEM/Microsoft_DOS//Ma...