I did not want a smart meter, and I resisted, until not having one was going to cost me money.
I do believe they can be fitted in a dumb mode, and my smart meter came in two parts, the top part does the coms work.
But I still can't read the smart meter direct. Two buttons control the display, and I need three readings, export, peak and off-peak, the rest is really of little interest. But I have been told what it should say, and I have found one or the other every so often, but I pressed buttons many times and still not a clue how to get the readings.
I can with smartphone or PC see what I have used or exported, and the in home display says if importing or exporting, and without one I will not be paid for export, so I need one.
So if you have an EV, solar panels, off-peak heating, no option, but otherwise, can't really see any advantage. And when I wanted one, September 2023 it took until February 2024 and three visits to get it fitted. And I had to get the solar installers back to move their consumer unit to make room for the larger meter.
As to if the deals with weekend free power etc, make it worth while I don't know, my annual bill is around £100 to £200, due to solar panels, so never used the offers.