Because there are no good Icon Packs available in the Theme Store (compared to the ones in the Play Store they are objectively bad imho) there should be an option to import Themes or Icon Packs which are bought in the Play Store to the Themes App. Icon Packs and Themes with the Good Lock Themepark App are not applied to new installed apps so this isn't a way either
As OneUI 4 has far better Energy Saving Options and Modes to improve the Performance (deep freeze background activity for example) than other smartphone makers which helps to get my A53 a lot of battery time I really hope Samsung makes an update which also gives a good posibility to change the icon shape consistently