A friend just had a huge housewarming. Everybody brought gifts because that is what is expected around here for a housewarming party. It is viewed as a type of shower, just a house shower. There was mostly wine, then some personal gifts like sports team memorabilia for their favorite sports team, lots of kitchen stuff, quite a few pretty frames, one live plant but not a candle or a plate of cookies/brownies to be seen.
I have to admit that with any kind of candle in a jar, while the thought would be most appreciated, it would be put aside for regifting (actually donation pile because I would never give a candle unless I knew somebody was really, really into them.) Same with homemade brownies or cookies, the thought would be much appreciated but they would just be thrown away as I do not eat a whole lot of sugar for medical reasons.
I would also never bring a plate of homemade goods to a party of somebody I didn't know very well. The hosts may have a menu planned which my food may not fit in well with but they may feel obliged to put the dessert out with their menu anyway. Seems a bit rude to me.