Most of the time I've found that I'm making them narrower, not wider. I can't argue that an optional setting would be handy for some people, but then what when you have 10 fields with no criteria and they're all way wider than they need to be? I suspect that some things could be created with options but are not because it is quite easy to end up where you want to be without having to program more features into a product. Excel might be another example wrt default column width or row height - no setting for that either (AFAIK). My theory is that it is so easy to manipulate these things so why bother programming a feature for it?
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.