Act 3 got smaller? Or did The waterways get smaller so the drowncity could get extra massive?

Matlan Waterways are smaller(never had an issue with that smaller zone imo), but i feel the coding has an error... where when they reduced zone by X, they the deficit of area of X is now some how amplified (2X or 3X), thus drowncity is now like 3 screen big... thus any seconds saved from the smaller waterways has been negated via the extra long and "not interesting" drowncity...