[Geysers] Question about what backcountry areas are off limits

[volvox at copper.net]

First time poster here and long time GOSA lurker.  I'm hoping someone
here can answer these backcountry questions for me:

1) From years of reading The SPUT and various geyser books, it seems
that the kaleidescope group, thud group, myriad group, 100 springs
plain, and Pott's hotspring basin are all off limits to the general
public.  Is this true, and why?  It seems weird since other
backcountry areas just as dangerous are not off limits.  I'm guessing
it is because these particular areas are highly visible and/or would
receive too much traffic.

2) Are there any other areas that fall into this category?
Specifically Geyser Creek (since you go off trail at Artist's
Paintpots) the area behind Pink Cone.

Sorry for the long post, but these are questions I've been wondering
about for quite some time.  If you know of any other sources where I
may find information or answers, that would also be appreciated. 
Thanks in advance!

Scott Walker