Sparkle Type Design: Expanding vs Keeping Editable in EPS Format

Sparkle Type Vector Designs or design elements that are typically created with gradients in a shiny or light effect style—do they need to be expanded before submitting? I’ve seen many people upload such designs without expanding them so that they remain editable. How is that even possible? If you save these kinds of designs in EPS 10 format without expanding them, the design does remain editable, but upon reopening, the design doesn’t maintain its original quality—it gets distorted or ruined! Is there any issue if I expand and upload these designs, making them non-editable? While I understand the designs will likely be approved, I’m wondering if there will be any problems in the future if I submit non-editable versions, even though many people keep such designs editable.