Just as you said, there is some local support from Apple. However, it can only be practical for the images saved at a later time. For the existing images, we also have to turn to heic to jpg converter for help. The heic converting tools you mentioned are popular and widely-used by majority of users. One of that is Joyoshare HEIC Converter. I like it! What let me appreciate this wonderful tool “JoyoShare” is that it can recognize all types of HEIC images with ease. But iMazing and iMyFone cannot do it without hassle.