1st off to me is the cost. Jarred food is so expensive. 2nd is taste. I really hate most canned foods so I don't want my kids to get used to the flavor. 3rd, I really don't trust what might be in the jarred foods (filler, germs, etc). When I made baby food I knew exactly what dd was eating.
I did make all my own purees for dd, she had 3 jars total of "baby food". Ds has had 1 jar of sweet potatoes that someone gave me. I've done child led soolids with his and the jarred potatoes were sooo runny that I had to mix oatmeal with them so that he would eat them.
When dd was little and I needed a portable food I'd bring a banana, a spoon and a sandwhich size ziplock bag. When it was time for her to eat, I'd peel the banana, stick it in the bag, zip it closed, smush the banana with my fingers, open the bag and feed her out of the bag. Cheap, easy, healthy, portable.