I do a lot of historic restoration. One of the “key” rules is to not improve the design. That is to say, we recreate what was installed, whether it’s style of trim, type of stairs, or whatever. And perhaps your window trim should not be changed, either.
I call the style of your window and trim, a “farmhouse” window. Changing the design within a house would not be appropriate, especially within the same room.
However, where a simpler style house is being built or renovated, perhaps a simpler style window trim would be appropriate and acceptable.
Another consideration is using “what is expected”. Often we try to make things smaller or simpler and it then they look out of place or too unusual. I’m thinking about perhaps eliminating the stool or head piece. Either would save time and money, but you’d loose that “classic” style (character).
One of our biggest problems is trimming a window that shows end-grain AND the trim is stained. When the trim is painted, we can usually fill the end-grain texture to match the surface of the trim. However, when it’s stained, the end-grain tends to absorb more stain and it’s often much darker. One way we’ve tried to correct this is to mitre the ends of the trim “back towards the wall”. This gives the same surface on the end of the trim as on the surface so it will accept stain at the same rate as the rest of the trim.
It takes a lot of time, but looks great.