This is only true because of abysmal quality of bookkeeping.
Choices and conditions they were made in are not documented in non-ephemeral form - often email, word of mouth and even if at all, in strongly lossy compressed way.
The more lightweight you go, the more information is lost. You can easily use hardware made in 60s. Trying to use some software today made half a year ago can be a journey.
(Algorithms are another matter, they do sometimes survive if they are well described.)
Learning is involved in anything but it is not the process of making software. It is not the process of anything, as it cannot be put in a neat box for any management. A process is at most output of it.
The more lightweight you go, the more information is lost. You can easily use hardware made in 60s. Trying to use some software today made half a year ago can be a journey. (Algorithms are another matter, they do sometimes survive if they are well described.)
Learning is involved in anything but it is not the process of making software. It is not the process of anything, as it cannot be put in a neat box for any management. A process is at most output of it.