If you have terabytes of data in iCloud, use their mail, contacts, photos, everything? Plus decades of purchased content, expensive devices losing functionality by dropping the iPhone… you have to basically replace everything with something else and it’s tedious especially for a less techy person. This is the reason walled gardens are anti consumer.
7th generation is retro. I’m sorry but the PS3 and 360 came out almost 20 years ago. The 360 is as old now as the NES was back then