For most caps yes. But have you encountered poorly manufactured ones, that are essentially defective, require vices and power tools?
Not yet. Though my older spouse (who is still recovering from a broken dominant wrist) has run into the strength problem.
Apparently even the prez had troubles with those safety caps. Bob Woodward said Richard Nixon asked presidential aide Stephen Bull to open a pill bottle for him. Bull noticed the container had teeth marks where Nixon had apparently tried to chew his way into the container. Funny thing is Nixon signed the bill in 1970 that ordered the use of child-proof containers. IIRC, Nixon would have been around 60 at the time of the alleged incident as he was born in 1913.