For similar reasons, I also refuse to join SGs.
In the old days, I liked Guilds/SGs. I enjoyed socializing, and grouping together. I liked using guild chat and only using voice chat for grouped missions. Now, I try to use SG chat, and someone tells me to use discord. I don't like discord for regular chat. I'm often watching TV or talking with my gf on the phone, and discord gets in the way.
I've joined several SGs and found that the public SG base is better than private SG bases. The public base is small and simple. It is easy to use its features. The SG owned SG bases are large and complicated.