And while progressive overload is needed, no one is going from the bar to massive weight overnight. Also, not everyone needs to have the goal of being a power lifter. Peter Attia talks about wanting his older clients to be able to a 45lb kettlebell squat, the average weight of a toddler grandkid for example.
Yeah, people do worse in real life. They pick up stuff of varying weights all the time at odd angles.
Also, I would say that your grip is going to be a bigger liability in those situations.
A trainer spending a year "strengthening your core" is called theft.
I'm a man and know more about mens standards, but if you can't back squat at least 1x your bodyweight you are probably pretty weak. Similar for deadlift. And these are just bare minimums. Most humans are FAR more capable than this. Maybe just multiply these by 0.5 for a women just based on genetic strength differences.
You can start with the bar if you want, you will eventually learn through experience based on your body your form for squatting. And the internet as well as being able to record yourself are readily available for practically everyone. Given that you can definitely learn the basics of form without necessary needing a trainer.
That's what we call a benefit. The reason those people are suddenly lifting their body weight? They've gotten stronger! Deadlift from day 1, people. Your back will thank you. If you're worried about it, ask someone to check your form at the gym (most people are friendly!), or just post it online (I did this when I first started lifting).
Being able to bend over and pick something heavy up off the ground is a pretty fundamentally important human movement.
If you are an olympic lifter, almost everyone is taught how to bail these lifts from the beginning with the empty bar. Most people aren't and lift in racks built just to be able to safely lift heavy. Its on you if you don't actually set up the safety bars for yourself.
Even barring that, the injury rate in squatting is quite low compared to most other sports and athletic activities of similar intensity.
But many people aren't going to follow those routines. It's my impression that deadlifts and squats aren't good exercises for this use case because of the danger they present.
Sure, they might be "completely safe" when "done correctly", but somebody using an app and trying to mimic exercises they see in videos or pictures is only guessing at whether they do the exercises correctly. To build muscle you need progressive overload, but that also means that "doing the exercises correctly" gets even more difficult. With most other lifts it's not that big of a deal, but with squats and deadlifts the weights get really high. A dropped barbell with squat weights can easily lead to injury. Hell, it can lead to injury when it's even just lifted the wrong way.
And when you remove those two lifts then a lot of 'standard full body workout' regimes don't work anymore.