On points 1 & 2 I recognise your greater experience.
On points 3 - sometimes and will depend on your definition of huge.
On point 4 - wrong expensive hi-fi lets you hear far more of the music in a far more involving way provided that your hearing is up to it. Can hearing be affected by too much of point 1??!!
It's quite simple:
(1) Plug headphone output of computer into cassette deck's "Record In".
(2) Load a cassette long enough for the thing you wish to record.
(3) When the stuff you want to record starts, press Record and Play.
No need to thank me!