Originally this SWC system became active after the Russian Empire's withdrawal from the Eastern Front, that is, after the Allied nations felt the crisis that 'Ah, we might really lose this war if we're not careful!'
Until then, orders made by gathered Permanent Military Representatives were often considered 'something the field could reject at their discretion', with BEF Commander-in-Chief Douglas Haig being a representative figure.
However, it's difficult for the field to ignore content agreed upon by their own Prime Minister at such an important meeting.
'Everything will be decided at this place!'
'This is the last chance to move the Eastern Front. We absolutely cannot miss it.'
'Let's all speak openly in front of everyone.'
Though it would normally be a meeting led by Prime Ministers like a summit, the personnel increased for various reasons making it look like a party meeting in parliament.
"Then, let's begin."