It may seem like it's "convenient", but whatsapp is truly a nightmare when you try to move it literally anywhere in any way. Huge backups, needing to transfer phone numbers, having to restore from backups, having and moving those backups in the first place, the way it's designed in that regard is the most inconvenient for a platform that doesn't even necessarily provide more security or anything for that to be worth it at all, particularly for people who don't even seek that kind of security or even know about it and just use it for "texting and stuff". Not to defend that or say that it isn't just a convenient excuse (it can be for sure), but just to say that whatsapp is possibly the most annoying app in that regard. It's such a pain in the ass I'd rather store all of that in the cloud. (Which ironically whatsapp pretty much just does anyway if it backs up to google drive, it just makes it the most inconvenient it could be)

Is it that hard? Every time I moved to a new phone, whatsapp's backups are in my google drive and restored without any problem whatsoever