IMO, if you're losing coolant it's better to find out where it's going than to top it off and ignore it.
My LS was purchased when it was 10 years old with an accumulated 36k miles. The only dealer service records were for charging issues - dead battery. Obviously, this car wasn't driven much. I also doubt the coolant was ever changed before I did the timing belt at 96k in November 2021.
The coolant top tank (reservoir) was always low but would never empty. When I did the timing belt it was obvious where the coolant was going. There was never any evidence of this on the ground, no doubt due to the engine under cover.
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Yes, Toyota Long Life coolant (00272-1LLAC-01) is pricey. Replacing the coolant at 60k miles or 4-5 years is reasonable based on what I'm seeing here.
Apologies, getting way off topic now.