My guild is about 120m GP. I'd say we have 30-40 very active players (log in multiple times a day), but rosters are not perfectly built for HSTR.
Some new members who have left more intense guilds are saying that we need to spreadsheet it out: record everyone's squads and assign people+squads to specific phases etc... This is way more work and commitment than our guild wants. It requires individuals to log in for very specific, short windows of the 2 day time limit, and puts pressure on them to hit certain % damage marks. It goes against the "semi-casual" philosophy I hope to maintain for this guild.
So the question is: Does maintaining a semi-casual environment preclude us from farming HSTR?