Apps don't need to get reinstalled when a developer updates them. They will automatically update and you don't need to action them in any way, so there is nothing to worry about with that!
Are you using many apps? If you have any questions about your store or anything else, don't hesitate to let me know!
Nick | Community Moderator @ Shopify - Was my reply helpful? Click Like to let me know! - Was your question answered? Mark it as an Accepted Solution - To learn more visit the Shopify Help Center or the Shopify Blog