ORIGINAL: Emobama
You may be able to download it and all of the patches from Steam as well and use it not matter what the changes are in the market which may make the media you have purchased from the retailer obsolete. I think that is more useful than your copy of Lords Of Conquest on a 5 ¼” floppy.
Well, early storage media (floppy disks) used to be supported + widely used for like what ... say 17 years? (say 1978 - 1993/94), with a step from 5¼” to 3.5" in between, and a transition phase between the next big step to the CD-Rom, but where you could still buy games as floppy version or CD-Rom version from around 1993-1995.
The CD era "lasted" for at least 12 years (say 1994 to ~2006) until most games were pressed on DVD media, with smaller applications still being "pressed" on CD-Roms.
Digital stores usually grant a redownload period of 2-10 years, with some of them restricting the number of downloads to 10 (battefront.com, IIRC) for example.
With a digital download, there's a chance that you end up with NO game copy at all, in case you upgraded/lost your PC hardware or let's say data on your memory stick several times, especially if you didn't create any other physical backup, and if your download period ended (bigger DD portals featuring limited DL periods will boldly state that your DL period ended and won't reactivate your download) or if the number of allowed downloads had been reached.
Also, you don't know how long a given DD service will be available these days, unless it's the market leader (ie. Steam).
With a physical copy, and with today's downward compatibility (DVD -> CD-Rom) you'll have at least another 10 years (wild guess) or so until DVD drives won't be available anymore, so you'll have like what, +/- 20 years of "guaranteed" usability for optical storage media obtained in late 90s or around millennium?
Maybe it's just me, but physical copy then sounds a tick more reliable/durable to me, no? [:D] I can clearly see where ppl's resentments may come from.
Btw, I never get physical copies at Matrix, I go for the DD.