Last time this topic came up it had similar reactions both ways unsurprisingly. At the time I had a T5 2.5 van for work which had been changed from 130 to 174 power. The query I had was that VW made both variants already with the same engine, mine was changed from one to the other, it was regularly serviced and run on posh diesel to maintain efficiency, don’t drive like a nutter. The extra torque/grunt was handy for load lugging and mpg improved slightly too. Engine working less hard? Would emmissions be worse? Not sure. So it seemed a much better van to me overall but some views here did make me question whether it was the right thing to have had done and perhaps think of the bigger picture if the emmissions were in fact now worse (still don’t know).
Latterly replaced that T5 with a T6 work van which is in as supplied power (150) with start/stop bluemotion technology (?), will continue with regular pattern of servicing/posh diesel and style of driving. Basically will leave this one as is, seems fine.