I agree that the cloud isn't even close to an alternative, and TBH even if connectivity and throughput were adequate everywhere (internationally, in the air...) I'd probably have trust issues
. But for me the question is more about having sufficient storage and convenience of access for backup and transfer, rather than removability per se.
The way I see it, if the device fails then any data on a removable card are safe, but anything else I need to have backed up. If the card fails, anything on it that I've not backed up is gone. So I need to think about backups either way, whether for internal storage or removable. Removable storage is desirable because it gives flexibility, and I'd much prefer the Android team to standardise support for it rather than remove it. But it's a factor rather than a deal-breaker for me.
Non-expandable and insufficient is a deal breaker though.