Are you suggesting having 2+ copies of your infra so that you can withstand losing one of them? I've never heard anybody propose this approach before.
> If you want to build a _reliable_ infrastructure, the only rule is to avoid singe point of failure. Account is one of those.
I'm not sure which sense of the word "reliable" you're using here. Usually durability / continuity of business conversations focus on having backups in other accounts (on same or different IaaS providers).
Availability conversations are usually centered around multi-region within a single IaaS provider, and that can be in a single account. Sure, you could build it to use multiple accounts, and you might pat yourself on the back if it ever actually saves you, but how long would it take to build that and what else could you have done with that time?
> I've never heard anybody propose this approach before.
Some people do, some people just talk. Noone proposed don't mean noone did.
> Usually durability / continuity of business conversations focus on having backups in other accounts
That's quite poor quality of conversations then. Continuity of business is much wider than having backups.
> how long would it take to build that and what else could you have done with that time?
Lesser than you may have expect. What could you have done with your time is certainly a good question, the best asked when your infra is down because cloud provider blocked your account. As I mentioned in original comment, if you ignore probability of that, then you are just not experienced enough.
> If you want to build a _reliable_ infrastructure, the only rule is to avoid singe point of failure. Account is one of those.
I'm not sure which sense of the word "reliable" you're using here. Usually durability / continuity of business conversations focus on having backups in other accounts (on same or different IaaS providers).
Availability conversations are usually centered around multi-region within a single IaaS provider, and that can be in a single account. Sure, you could build it to use multiple accounts, and you might pat yourself on the back if it ever actually saves you, but how long would it take to build that and what else could you have done with that time?