as i said it depends on how you use it. it doesn't make sense to call the api to fetch a list of 200.000 devices or callflows. use v2 for paging and/or use the search api.
If you look at
KAZOO-4326 one more time, you can see that I stores one callflow via kazoo API. For database containing about 20 000 callflows 30 sec to save one callflow is much. Think saving 200 000 callflows via kazoo API took about 1-2 months.
also, the question was about same realm not same account. you can have a common realm for many accounts.
I has tried assign same realm to two accounds but get error.
finally, as with any other software, kazoo does is not "completed" and there are optimizations tat can be done.
I completely agree with you. Moreover, I believe that what I have described would not require major change in the kazoo. And soon kazoo can be successfully used for the described case.