You may be able to describe them that way, but it wouldn't be an accurate description of the entire field. Eve doesn't fit that description, neither does A Tale in the Desert, and I'm reasonably sure there are others as well. But even two is more than enough to disprove your claim.
OTOH, advancing a character through quests is a gamestyle that has a long pedigree...going all the way back to the original D&D. Plenty of people seem to like it, so it's not too surprising that plenty of games will provide just such a style of play.
Frankly, the worry that a format can become obsolete is absurd, because any format can (and will) eventually be obsoleted. You could never buy any music if that's your primary concern.
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Then feel free to make your own, instead of taking what someone else made, without their agreement.
OTOH, advancing a character through quests is a gamestyle that has a long pedigree...going all the way back to the original D&D. Plenty of people seem to like it, so it's not too surprising that plenty of games will provide just such a style of play.
Frankly, the worry that a format can become obsolete is absurd, because any format can (and will) eventually be obsoleted. You could never buy any music if that's your primary concern.