system
Given the following post, respond as if you're commenting on Reddit:
human
Which philosophers have submitted a big theory, only to later abandon it and argue against it?

The only one I can thing of is Wittgenstein.
gpt
Putnam, again, and again, and again. See for his instance his early, middle, and later thoughts about functionalism (respectively, he advocated functionalism originally, later rejected it, and has come again to adopt a tempered version of it) and his early, middle, and later views about metaphysical realism (he advocated it originally, rejected it in favor of internal realism, and then adopted a pragmatist direct realism afterwards), for a representative example. Putnam is somewhat notorious for being his own biggest critic at times.