Bikes and retirement aside, I’d recommend knowledge - career skills, but also handiness skills. If you can do simple repairs like replacing a door, changing the flap on a toilet, painting, preventative stuff like changing your air filters, simple electronics (replacing a light switch), etc you’ll save thousands on repairs as a homeowner. Today there’s almost nothing that you can’t find an in depth video tutorial on, but if you really don’t feel comfortable with basic tools most community colleges have cheap classes as do some hardware stores. Volunteering, even just to help friends with their projects, can be an amazing way to learn too.
A better critique would be lack of ability or safe routes, since many workarounds are needed to allow kids and those physically less able to get around by two wheels.
The vast majority of adults travel within 10km of their homes for most errands, which is definitely possible to hit with an analog bike. Ebikes can enable making double that distance easy.
That being said, even in actually rural areas where you are biking on a narrow shoulder with 50kph+ traffic next to you 20km each way in 0°C temps, many that don’t have other options still bike, so really it’s a preference for comfort/safety not lack of ability stopping most.