What a laughably bad excuse.
How long are your showers? Mine are usually about 15 minutes.
Per the US EPA the average shower is 8 Minutes
Per Apple the watch takes 2.5 hours to charge to full. 1.5 for 80% or about .5% a minute for the first 90 minutes
Even with my 15 minute showers I'd get a ~13% charge. That's a little of 2 hours worth of battery. Idk about you but generally I need at minimum 6, and try to shoot for 8 hours of sleep.
To get a solid 8 hours of life you would need a ~45% charge. So anyone who wants to charge this during a shower better be taking 50 minute showers at a minimum.
I don't think it's outrageous to suggest a company compete with on something a basic as battery life when their competitors have proven it possible for 7 years..