I don't buy that. Bad battery life was certainly an issue with GPS tracking >10 years ago. The GPS tracker I bought sometime in the 2000s lasted about 7ish hours on a single AA battery — not enough for an all-day hike. But I don't think it is true now. In fact, I know that
Sony knows better (you will see why below).
Technology has evolved quite a bit since then. I have plenty of GPS devices with way smaller batteries and very long GPS tracking battery life. My Wahoo Elemnt Bolt lasts >10 hours when refreshing its GPS position every second. A modern sports smartwatch like
Garmin's Forerunner 745 has 16 hours in GPS mode.
The Forerunner 945 has up to
36 hours and 60 hours in a special mode where you record your GPS position less often. And smartwatches have way smaller batteries than dslrs or mirrorless cameras.
You might say that “well, Sony doesn't know all that.” Oh, but they do. That's because they make what is probably the
best GPS chipset for modern sports smartwatches, including the Forerunner 745 and the Fenix 6-series.
I get that maybe you want to make GPS tracking optional to conserve battery life, that's alright. But it is nowhere near the battery drain it once was and IMHO should just be standard on any serious camera, including the lowest of low-end fancy cameras. Having GPS data included in your EXIF data is a huge boon. And adding them after the fact is just so much faff that I just don't do it.