OK - just thinking outloud & feel free to skip the entire self indulgent post 
I feel the same and I'm not too sure why exactly either?!
(I'm in my 40's - I think it would be interesting to know the approx ages of people posting.)
Pouches/modern plastic organic tubs/pots - OK occasionally or even every night when they are refusing any food, even that prepared by the loving food fairies. It is just less stressful if it's not something you have spent ages making. Fact.
Jars - savory - work of the devil, sweet marginally OK at a push.
I think Jars = 'the work of the devil' is partly because they do smell digusting & taste even worse, I wouldn't want to eat it, so feel terrible giving it to a baby to eat, but even that is ridiculous because formula is vile as well and I don't feel the same about that & secondly because there is that thing that if you feed your baby jars - you just don't love them enough. Fuck only knows where that comes from, but it feels fairly ingrained, even though I don't actually agree with it 
However, if you feed them organic, 'healthy' pouches or tubs which have 'all the goodness & flavour' sealed in, then you are really giving them the best thing possible - better even than homemade, which wasn't sealed in a field somewhere before the veg was an hour old. They do smell nicer and some are even vaguely edible.
I think there is something in the pouches/tubs are safer, glass is not. They 'seem' more environmentally friendly (even though they are probably not or are at best probably the same).
I wouldn't even register someone doing it out, but would probably be a bit
at a jar at home but not so much a pouch/tub.
I think a lot of it harks back to 'food is love' :( Love is missing if you give your baby food out of jars. It's acceptable if they aren't going to bloody eat it anyway though. It's total shit, but clearly ingrained somewhere along the line.
It is weird.