Is there a benefit to having a switch control an outlet?
It's in the Building and Electrical Codes
You may have noticed that you can walk into a room that you've never been in before, and reach for a light switch, your hand has a really good chance of finding it.  It's almost like magic, and it's so universal that people take it for granted.
Actually, it's no accident.  It's required by both the electrical and the building codes. Every room must have a light, and the light must be operated in a switch located at -- well, your hand knows.
Here's another non-accident. Ever go up a stairway, go the first couple of steps and then your feet just know what to do?  That's because of a rule that says on a stairway, every step's rise and run must be identical.  This is what happens if it's not.
This is one of literally a thousand rules in the Building Codes designed to keep people safe.
A switched receptacle is allowed as a substitute for an overhead light
Normally, Codes require that the light switch operate an overhead light or other built-in lights - sconces, cove lighting, etc.  However, builders lobbied to get an exception to allow a switched receptacle instead -- on the presumption that someone would plug a floor lamp into that receptacle, and be contented with that as the room light, and switch the light only at the switch.
The reason builders wanted this is, it's cheaper.
Of course, this is a bad plan for exactly the reasons you are observing - #1 people will switch the light off at the light, and #2 it renders the receptacle unusable as a plain receptacle.  This is especially bad with the consumer electronics revolution, where people have an exponentially increasing number of things to plug in other than lamps.
Unfortunately, you only have 2 options for eliminating the receptacles.

If the wiring permits, convert the receptacle to a half-switched -- meaning one of the 2 sockets will be switched by the light, and the other will not.
Install an overhead light, sconces, cove lighting etc. hardwired into the room, and rewire the circuit so the switch operates the overhead light instead of the receptacle.  The overhead light will satisfy the Code requirements for a functional room light.