Having had a DSG 7R for 7 years and 2 mk5 GTis i may have an opinion
I would say the DSG is a great gearbox but does numb the driving experience, is your 5 GTI a DSG, if so i'm sure you will like it
Yes you can use the paddles or gearstick but very few do but lets not make this into a DSG v Manual debate, ETTO.
I would agree that is a very low spec car for quite a lot of money, they did great lease deals on the R and so many stepped up from 5/6 GTI into the R on poverty spec.
DCC is only needed on 19' wheels that that R doesn't have.
Yes the Tec on the R is light years ahead but when i sold my R last year, getting a 5 GTI , a £400 upgraded Pioneer Car play stereo upgrade was enough ,didn't miss anything else really.
I do think VW built more solid cars in the MK5 era, my current 7 GTI rattles more than my 5 ever did.
Finally, when i bought m R for £36k in 2014 , and got £6 for my 5 GTI DSG , did i think the R was a £30k better car , not in a million years, think the 5 GTI is a brilliant car and sometimes more isn't always better, test drive a few and others brands.
When i sold my R for £19k and climbed into a 5 GTI did i think it was £14k worse , no way.
Happy car hunting