I guess the first 2 points are really applicable to adding sugar in general. Both dex and table sugar will lighten and thin the beer, so your points are valid.
I'm not sure if you are 100% correct about the fermentability, but I see I am incorrect about the higher ABV - both dex and table sugar are 100% fermentable, the only difference being table sugar will take longer as the fructose needs to be converted.
When brewing extract, the information I have read still tends to suggest to use dex due to the cidery taste, though this isnt an issue with AG.
Next time I make this ginger beer I'll try table sugar and see if I notice a difference compared to dex, both in ferment time and flavour.
I'm not sure if you are 100% correct about the fermentability, but I see I am incorrect about the higher ABV - both dex and table sugar are 100% fermentable, the only difference being table sugar will take longer as the fructose needs to be converted.
When brewing extract, the information I have read still tends to suggest to use dex due to the cidery taste, though this isnt an issue with AG.
Next time I make this ginger beer I'll try table sugar and see if I notice a difference compared to dex, both in ferment time and flavour.