I figured Chaos 5 was entry level due to the damage requirement being 7 million damage per second per player [15 billion HP/(540 second enrage timer x 4 players)], and Chaos 5 Poharan having roughly HP/player as REV-A DEV-A in Steelbreaker. Given that Soul Boost gives Steelbreaker gear very early on, progression-wise, it's reasonable to assume that a party full of halfway through Soul Boost characters would have the damage to clear Chaos 5 even with no crit rolls, as they'll have gear better than what's needed to clear REV-A DEV-A (ie. better than Thornbreaker/Scarlet Gear), to say nothing if someone with massively more firepower helps out.
Don't know about the accuracy requirement for Chaos 5, but Soul Boost does provide crit primers.
As for others kicking you out, well, that's out of the scope of what's theoretically doable. Some players do care about gear for stage 5, others don't.
Chaos overall is an easy fight compared to the other dungeons. No mechanics besides eliminating adds, slower attack speed, mostly frontal attacks, fewer cc attacks compared to, say, Chrysus in Trials.
The primary reason that I do not actively suggest new players farm easy modes first is that, on top of already being doable mid-Soul Boost and Chaos being a Soul Boost target itself, it would help to concentrate new players in already active farms. Easy mode feels a bit like going out of the way. It can be done, but it doesn't feel efficient.
This debate is going to be a moot point with the next Soul Boost through, as Soul Boost 3 will hand out Shadow Fury Soul Shields, assuming we get a match with the Korean server's Soul Boost 3. With that, easy mode farming won't be necessary to get Shadow Fury Soul Shields, and it would be natural progression to go straight to Chaos 5.