Really.... connecting at Changi is like the easiest thing on earth... travellators all over the place for the lazies, sky trains connecting all the terminals, clean, airy, lots of things to do if you're not in a hurry...
Anyway, it might be indeed confusing for some people and it's understandable. not everyone flies once a month or is "airport savvy". Imagine someone who's flying for the first time and asked him relative of friend to pick him up at terminal X and ends up in Y. But then again, that relative or friend should be smart enough to look at the screens as soon as he or she gets to the arrival hall and then easily take the sky train to the other terminal.
For luggage, it's quite alright as long as there is ground staff pointing you at the right direction to collect them. I don't personally care where I land... follow the screens and go collect your stuff.
