I have a theory that they made us fight Deus like this to parse the skill level of the Global community so they can better balance the later encounters. Change my mind
Also solo PD harder than Deus by a long shot.
A little optimistic to think that SEGA team will balance contents for a minority of the EN playerbase that struggles with these contents. You will continue to get contents that are scaled to what JP already have and you'll have to either learn/adapt/think or suffer forever as resident floor gang. The gears you currently have in EN right now are EP5/6 tier stats, which are suffice to give enough leverage to clear current EN contents.
But player skills are still accounted for so, it just seems like some of the complaints here are due to unfortunate luck with pugs that are resident floor gang.