Philadelphian with deep Quaker roots weighing in here...
Everything Regan and H. Husted pointed out is true. And a lot of the knee jerk reactionary drama comes from (mostly right leaning) media pairing photographs of the Penn statue sitting atop City Hall with dubious headlines which imply that NPS intended to remove that landmark statue. Most folks bent out of shape over this never even knew the other statue existed prior to yesterday's news.
Furthermore, Penn was a Quaker and humbleness is one of the faith's core values. Penn didn't even want the colony named after him. So a statue of his likeness atop City Hall and a duplicate in a park aren't really the best ways to commemorate his role in the shaping of Philadelphia's history.
The current "park" is not very welcoming and some of the proposed changes would be an improvement - adding circular benches to form a gathering space, plant buffers on three sides, expanding Lenape representation and history and, yes, removing the Penn statue.
Where I think the NPS went too far is that it should not have proposed to remove the commemorative model of the Slate Roof House. It's tiny, modest and relevant to the history of the location. I can see where that, coupled with the vagueness on what will be included on the future south wall exhibit panels, plus people's general lack of knowledge about the space in its current form, and media click bait have led to outcries against the entire proposal.
Pity, because it's a chance to improve Welcome Park and make it truly a more welcoming, green and utilized space.
Do a 360 of its current state and you can see how unwelcoming it is. Interesting, sure. But not any kind of park befitting a "greene country towne" (seriously, the stormwater runoff alone could be cause for a refresh to include gardens/green space) nor a welcoming gathering space.