On the subject of what need there is in the Star Trek
universe for conventional modes of transportation, such as shuttlecraft, trams, ground cars, etc., for travel around cities and planets, the following occurred to me.
From TOS: The Tholian Web
SCOTT [OC]: It's jamming our transporter frequencies. I've only got three of them working, and I'm not sure of those. One of you has got to wait.
To me, that suggests the possibility that there might be the need to allocate transporter frequencies in metropolitan areas, for the same basic reason that radio frequencies are allocated IRL today, in order to avoid interference.
If that's the case, then there would be an ultimate bottleneck on transporter activity in any given area. Such a bottleneck would create an actual need for conventional modes of transportation, such as those mentioned above.