For what it's worth...
I completely disassembled my front brakes when my car was brand new (I was painting my calipers). There was very little (if any) lubricant on any of the usual places including the slides. I cleaned/lubricated everything as I reassembled it and my rotors barely have a scratch on them at 80,000 miles. I'm also very easy on my brakes.
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View my fuel log 2015 Mirage ES 1.2 manual: 52.2 mpg (US) ... 22.2 km/L ... 4.5 L/100 km ... 62.6 mpg (Imp)