No, not enough chill means little flowers. Best to find low chill fruit to set flowers. But if they set flowers, they will then fruit!

You are not in a good climate for an ornamental fruit tree (like the Okame cherry) and are also restricted to the type of fruiting tree you will be able to grow. Unfortunately, that is just a fact of your location and winter climate.......not all trees can be grown successfully in all climate zones. But if you look at if differently, YOU are able to grow trees that will not survive in colder winter areas!!

Fall color is not the easiest thing to achieve in SoCal :-) I'd look at Chinese pistache or ginkgo - both will color reliably in your area, as will Japanese maples IF you can provide proper growing conditions for them. I'd also consider Japanese persimmon.

For spring flowers, look at Pyrus kawakamii, evergreen pear - gorgeous, white spring flowers and should also develop decent fall color (red).

According to the Western Garden Book, there are a number of apple, apricot, peach, nectarine, etc. etc. varieties that do well in Zone 22. Remember, I'm after the flowers, not the fruit.

Peaches are very ornamental IMO, here is my 3 in 1 peach

You need to know what variety of peaches have showy flowers. Peach flowers are divided into two types, showy like the Melikeplants showed above and the non showy. This type has small flowers, not an eye catching kind.

Peaches are self fertile. You don't need another peach variety to help it set fruit. If you plant the low chill peach variety, you will get fruit. Diseases and insects could cause damage on your fruit and make a mess.

I remember, even as a small kid that the peach tree we had in our yard (Zone 22) looked very nice in Spring and had a very intense orange Fall color.

I have no idea what variety it was. Do you know of any specific var. that flower well?

I think most peaches are showy. Those are "pride series" but I have some nectarines that make double flower which people consider showy (double delight). I like apricot blossoms too and plums the least.

I would not say that. I have seen as many showy as non-showy.

The OP needs to look up low chill peaches. Check Dave Wilson nursery is a good start.