When problems arrise, it's always the fool, and not the tool, that's at fault.
From Limbwalker's perspective, basal anchors are riskier than canopy anchors, because the climber's life support system takes up that much more space on the jobsite. Now it's easier for a ground worker to cut the climber's rope (happened to a friend of mine... lived to tell the tale), easier to drop a big chumk and have it damage a basally anchored line (happened to another friend), or even for another climber in the same tree to cut the other climber's line.
Like I said, we do allow basal anchors for access, and then require changing it to a canopy anchor. Also, we allow it if the climber AND Crew Leader agree that it is the safest option and it will generally be anchored on an adjacent tree. Option 1 has been used regularly since we added the policy. As far as I know option 2 has never been used.
The most interesting anecdote to me from implementing our restriction on basal anchors... I assumed that I'd get a fair amount of blow back since we had a lot of climbers using SRWP. The ONLY climber that complained was a DdRT holdout that like to float a pulley and base tie the anchor line. He ended up embracing the Rope Wrench and never said anything about missing the basal tie.
Honestly, I think SRT makes the work SOOO much easier, that it may just be laziness that keeps people using basal anchors. Its harder to establish a canopy anchor, so its equivalently hard to fail the system. It requies learning a few anchor options and learning how to mitigate the friction that can build up on SRWP systems with a lot of natural redirects.
Everything has changed in the last 15 years of climbing. OSHA and ANSI don't give any help in the way of guidance... thank god! I'd say it falls squarely on the company the climber works for to understand the tools and techniques out there and be able to train their people to discern the good from the bad. I am a climber, so I don't mind slapping other climbers in the face when they deserve it. I know climbers that do stupid shit and use janky cobbled together tools, but they don't work for my company or use that shit if they ever visit.