For certain areas, its still walkable like if you live in Nusa Duta or even Bestari Heights where you can walk not only to provision shops and cafes, you can even walk to the Bukit Indah CW3 bus terminal or to Tesco, Jusco and Giant. There are actually bus services around, by Handal and other operators but they are not common. For people who cannot drive/cannot afford a RM 2500 car, a taxi or don't want to travel much, then places like condos in Perling etc or even the fairway suites (at HH) will be ideal as you can just walk to the basic shops. There are also places where you can rent instead of buy to stay long term in.
There are also ungated & unguarded terrace houses in Bukit Indah area where walking to the amenities is a breeze and where the coffee shop are just very nearby. They can even take the CW3 bus easily by crossing over to the Jusco side. I am starting to see more SG cars or people (caucasian) who definitely are not locals staying at these areas.
There are ways to cope/circumvent the lack of public infrastructure, otherwise how would the locals survive?
Get scared or give up upon reaching the first obstacle they see?
No, i believe proximity to amenities as well as how they can fit into the place (by car, by taxi, by walking, by public transport) would be one of their key considerations prior to coming out here. People can see for themselves whether they can do it or not. In fact, one of my relatives had this concern about transport recently as even though she has a driving license, she hadn't driven for over 10 years. The place at Nusa Duta that she will be staying at will take care of that nicely, she just has to walk or cycle to shops and Jusco.
For people who cannot walk much, cannot cycle, cannot find a bus, cannot take a taxi, cannot drive or cannot afford a $2500 RM car or cheap motorcycle/electric bicycle, then....... there is still a place for them!
Units at a newly completed condo near the Tebrau city area behind Jusco OR the new condo units being built at opposite Tesco in Bukit Indah will address these problems as they can just take a very short walk to amenities. In the case of the Bukit Indah one, they can take the CW3 into SG and yet access all the things they need with easy access.