It is 99.9% operator error or valve setting or inadequate water pressure.
But yes
Some have swapped them out.
Their afterthought reasoning, due to many of us debunking the tankless heater problems was the tank-changers will have water savings because of cold water in The lines which somehow doesn't exist on tanked heaters and the GREAT installation expense was worth saving 20 ounces of water when they turned on the shower(water which could have easily been transferred to the toilet for flushing with just one Red. Solo. Cup).
Some were understood to have even said the time required between showers was somehow a bonus and it only took a half an hour of pre-planning to have six gallons, and no more, of not instant hot water.
more than one thought they could sell their used tankless for $110% of retail.
Punchline:
With a bit(minutes) of initial finesse and understanding the tankless works perfectly and never needs touched again.
You'll read lots of internet stuff which is justification after the fact and not facts.
Someone better at a search than I can point you to many threads on tankless operation.
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