The underlying, fundamental issue is whether the mower mows in straight lines (uses less battery to cover more ground BUT needs more sensors, software, gps, & cpu) or uses an algorithmic pattern to criss-cross the yard until everything is mowed (needs lots of battery, weighs more, sloooow completion of task).
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Do not take those as absolutes. I think it is possible to have an autonomous mower capable of local-only BUT Debbie says that the manufacturers are eyeing that $weet, $weet user data.