Except plenty of guilds in 2005 raided fine with Rets or the other ‘lolspecs’
I’m not proclaiming they were amazing or at the top of anything but it happened and most of those guilds were fine.
A guild falling apart probably had far more issues then a Ret Pally being in it FYI, this whole ‘Guild fall apart’ argument makes f**k all sense because I doubt 1 DPS role which can easily be replaced will destroy an entire guild.