5 reasons you should not ditch Windows:
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Your hardware is incompatible or you do not want to fiddle with settings or command lines
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Your applications/games only work well on native Windows (and not wine)
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You need serious group policy support or other device/software lockdown methods
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Your company policy requires it
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Makes helping Windows users harder if you cannot walk them through the same things they are doing
Of course if any of these apply you can always dual-boot or use a VM. I'm not saying you shouldn't use Linux at all.