I'm with you on this. I don't think your characters need motives at all. Life is an adventure and many people are lead on adventures they didn't expect and aren't equipped for. Those are the BEST adventures in my opinion. From the basics of 'conflict' it offers many more opportunities than a planned protagonist going through a story he's undertaken purposefully and is well equipped for. Those unforeseen adventures and never before encountered hurdles, are going to change your protagonist in interesting ways.
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