That's because the steering wheel gears are different in a car made for manual steering than one made for power steering. The manual steering wheel has quite a bit more leverage.
I drive a manual steered car. It's no problem at all. It's more physical than fingertip control, sure, but I like that. You can feel the road better.
I definitely would not recommend. Manual I think is ok to learn but I'd insist on power steering and modern safety features.
I own a manual currently. One big disadvantage (or possibly an advantage...) is when Friends ask to borrow car you need to ask "Can you drive a manual?" 9/10 times I've found answer is no.
I taught my daughter using a car that had no power steering. But it was a Nissan Micra, so it was still physically possible for her to turn the steering wheel while the car was parked...
Our truck has bad power steering. Such that it often handles as if it didn't have it. Holy crap is that a pain.