Vel0city's reply kind of covers why this doesn't work, but I'll expound on it.

Where does the bus go? If you have dense city cores with business, commercial, and shopping it makes sense.

Living near Austin, I could take a bus to a place like the domain and have shaded walkways where I could walk to most shops without dying of heat stroke.

If I'm not going to the domain, I'm looking at businesses with huge parking lots strung along stroads. Walking from the bus drop off to a store might just kill you on a day like yesterday where it was 108F, and parking lot temps are closer to 130F.

Also getting to where you want to go over the huge spread out cities may involve waiting for 5 or 6 different busses.

And then hopefully your park and ride is being watched and you're windows aren't broken out.

Admittedly, P+R is only a (kind of) solution for people of suburbia commuting into the office towers etc of the city. Pretty common scenario around the globe, but maybe not in Texas. Escooters are nice to cover the last mile.