With that logic, literally ANYTHING can go in Islands of adventure as long as it's an island. Isn't that what people don't like about DHS's so-called identity crisis.
Whether or not it was intended, every island at IOA is linked to literature:
Port of Entry - Pharos Lighthouse
Marvel Comics
Newspaper Comic Strips
Jurassic Park - Michael Crichton
Harry Potter - J.K Rowling
Poseidon - Greek Mythology
Sinbad - Sinbad the Sailor
Seuss Landing - Dr Seuss
That is not the same as what is going on at DHS, where people on here seem to be asking for a more defined structure, so we don't have RnRC on Sunset Boulevard along with TOT, B&TB and Fantasmic, and so that we wouldn't have had Disney Channel Rocks going up Hollywood Boulevard, and there wouldn't be a single land containing American Idol, Indiana Jones and Star Wars, and a single land containing Muppets, HISTK Playground, LMA and Backlot Tour.
People may not have liked Disney Channel Rocks, but a lot of the complaints were because it didn't fit the location, and because it made it difficult to move around the park. If there was a land themed to a music studio or music production, which featured RnRC, DCR, Mulch Sweat & Shears and American Idol Experience, then a lot of the complaints would not have happened. (there would still be complaints about show quality, but not about where it was happening.)
If, instead of what we have now, DHS consisted of Hollywood Boulevard, Sunset Boulevard, Lucas Land/Star Wars Land, Muppet Land, Pixar Land, Backlot, Walt Disney Studios, Walt Disney Animation Studios, Music Production/Hollywood Records, etc., then lots of complaints about how things are grouped together would be void.
There would still be complaints about individual attractions (AIE, Backlot, LMA, etc.), but there wouldn't be any about the park layout.
And, as for ANYTHING can go in IOA, how is MK holding up recently, with a messed up Tomorrowland and Adventureland - they suffer the same issues that people have with DHS, not IOA. If TDO had used one of the expansion pads for Adventureland and turned that into Agrabah, then there would have been no complaints. If they had had Tinker Bell beside Peter Pan, there would have been no complaints.