Callistemon
I'm not sure why history should be made modern.
I'm not saying that it should - just that I like the fact that the story is being made timeless, which (execution aside!) I think it is.
The story could be told in any era as a tale of a man who falls in love, pursues the woman until she gives in/marries him, and is blissfully happy for a short time until he gets bored. When that happens, everything she does annoys him, he finds a new woman on whom to fixate, gets rid of the first one, and the cycle starts all over again.
As has been said, this is a drama, not a history lesson. Using the bones of one story to tell another one is a perfectly valid literary device.
How successful this production will be remains to be seen, of course - we are only a third of the way in. I think it is flawed, but interesting. Anne's fear and desperation is made clear, as is the fact that she has done nothing to deserve it.
Also, Jane Seymour is not being played as an innocent virginal mouse, as she usually is, which is probably far more accurate historically. Henry married her 11 days after Anne's execution, which is horribly heartless, but typical of the way in which some people can simply turn their back on ex-lovers when they have tired of them.