hello friends , its time to indesign 2020..? see i made 85 pages kids book in indesing all are links , the size of indesign file is 21.3 mb, while in corel Draw 2020 same i make this book with same small pics resolution that is 300 dpi in both programs, but as you know that in corel all images are defualt embedded , but in corel the file size is just only 30.8 8 mb , surprisngly is not to big corel file size, and in corel you very fastly move any move as compare to indesign , i dont know why why why indesign takes it to big even its all are links, yet didn't check affinity publisher what it does with this book but i am sure its beat indesign in near future in all aspects..
Import and export
I really don't know why you're recreating this book in other apps when you already have it done in InDesign - seems like a gigantic waste of time.
InDesign is the leading software on the planet for creating books and page layouts.
Corel is good - I've used it before. Affinity Publisher is good - but doesn't have as many long document features as InDesign.
It's completely up to you what software you use - and if file size is important for you and you find other programmes utilise file sizes better - then use them.
Nobody is forcing you to use any software - you always have the choice.
For me, I choose InDesign as it's the leading software - and it's the most used, meaning that I can knowingly send native design files to printers or clients if needed - and I know that the person opening these will have the same software.
It would be highly unlikely that someone will have Corel or Affinity - and if they do it would be up to them to recreate in in those programmes.
Just as if someone sent me a Corel or Affinity file I would need to recreate it in InDesign - or buy the other programmes.
Completely up to you how you work - whatever works best for you and your clients and your output needs.
If there's anything we can do to help you further or if you need any assistance in making the file sizes smaller please let us know.