The phrase 'the issue is that' is correct and usable in written English. You can use it to introduce the main concern or problem of a situation. For example: "The issue is that we need to find a solution that everyone can agree on."
The issue is that cables longer than 600m are simply too heavy to winch.
"The issue is that Shrum likes to take control".
The issue is that Democratic voters are like Republican voters.
The issue is that floodplain management is deficient.
The issue is that individuals don't dwell on the dwelling.
The issue is that resources are always limited.
"The issue is that the planning is not implemented".
The issue is that Halsey is not alone.
"But part of the issue is that we'd never met.
"But the issue is that this is not reliable.
Further complicating the issue is that the Mets do not have a general manager.
Thanks to Ludwig my first paper got accepted! The editor wrote me that my manuscript was well-written
Listya Utami K.
PhD Student in Biology, Bandung Institute of Technology, Indonesia