"only to realise that no one really wants them" - 1 of every 6 new cars sold in the US are hybrids

"You have to have a specific daily drive for them to make much sense" - You'd have to have an extremely specific commute for an ICE car to potentially beat a hybrid (flat highway driving with zero traffic). Even then it's doubtful as hybrid engines can be designed to optimize more for efficiency since the electric torque can augment to make performance acceptable. Try to find an ICE car that gets better EPA ratings than equivalent hybrids.

"You're carrying two engines and to fuel/power sources, so mileage is terrible on gas and battery." - The corolla hybrid LE weighs 100lbs less than the ICE LE, in part because hybrid transmissions are quite simple in comparison to a manual/automatic required in an ICE car. In either case, hybrids have a huge advantage in the types of driving where weight matters (stop-and-go/hills) because they can reclaim that energy rather than losing it as heat.