There do seem two forms of complete rail-side rebuildings, one reduces (I think one is meant to say 'rationalises') the layout substantially and the other increases it! Sometimes you get one, and then the mistake is realised and eventually you get the other, often ending up with what you started with.
Swindon was one, reduced to an island offset to the Up side, a right nuisance for Down trains which had to cross the Up Main line twice. Finally the onetime Down platform was reinstated. As the main entrance building, and the town, were on the Down side all the time you have to wonder who came up with this one.
And, of course, Taunton. A real congestion point, fully rebuilt in the 1930s with four through platforms instead of two, and buildings on both sides. Regarded as a Grand Benefit to the town, who donated the station clocks as they were so pleased to have it. Come the late 1960s and it was pared right back, platforms on the Main lines closed, along with the Down side entrance. In a repeat of Swindon the town is of course on the Down side, you all now had to walk through the dark underbridge and round to the onetime secondary Up side entrance that few previously used. In the last few years, guess what ... Main line platforms reopened, and now the Down side entrance reopened as well.