While perhaps that's the case for you, it hasn't been for me and my three year old S6.
On the charger when I go to bed, off the charger when I wake up. If I do a long outdoor workout, I'll pop it on the nightstand charger while I shower and clean up. Only very rarely would I see a low power warning before it was bedtime - And that's without the fast charging capability of the S7+ models.
Since I have AC+ on it (SBTi was 2yr warranty +1yr AC+) I went ahead with an AC+ covered battery replacement once it was below 80%.