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If you're using something like TheSkyX, then you do want to know and enter your location within several arc seconds as well as your time within a second or so. The more accurate the better. As you say, that is easily achievable via many different means. Looking up the location on Google Earth in advance is a good one. Many remote and not so remote locations don't have cellphone signal coverage. A GPS receiver is just one convenient means.
I use a Garmin GPS-18x LVC with 1PPS output to both determine my location to within several meters and to synchronize my laptop's time to UTC within a millisecond. It's way overkill, but there's no Internet service for time synchronization and no cellphone coverage in most of the places where I set up.
For real overkill, if I really want to know a location accurately I use a u-blox LEA-6T GPS receiver with a geodetic antenna and fixed height tripod I bought on Ebay, collect RAW observations for a few hours and later postprocess them against a nearby CORS or SOPAC reference site. That tells me where I was within a several millimeters. Good enough to follow the local plate tectonic motion when observed over long periods of time (~30mm/year to the Northwest)!
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