My kids were in primary in NZ and were in uniform. Didn't stunt their personal growth or ability to shimmy up trees, rugby posts, and get covered in mud! After all, the uniform was a sweatshirt, polo shirt, and shorts, all easily thrown in the wash.
I am glad that they didn't start school until they turned 5. (It could be 6, if a parent deemed it best). They were just still not quite there yet, in terms of being able to keep up for the day. Four seems so very ditty!
A lack of a hot school dinner really isn't a tragedy. Mine had a good, healthy well balanced cut lunch, that catered to their tastes, and to their allergies, a good afternoon tea when they got home, and a good hot meal early in the evening, before early to bed, adjusting as they got older.
The girls ate before we did, but I/we always sat with them, talking with them, etc, making sure they ate nicely and well, and that they enjoyed their food.
I think my main thing is that kids need to feel a welcome part of things, both in their family and in the wider community at large. To be a welcome part of things, kids need to be given the tools to be genuinely welcomed - so manners, courtesy, and consideration for others - things that need to not just be taught to them, but modelled in front of them by the adults, as the default way of behaving. And because they're learning, because sometimes they get overloaded, or have a bad day, sometimes it's not going to go as well as was hoped.