Cosmetic filtering and script injection both work fine, they’re just off by default. Everybody works around rule count limits by making the one app register itself as like six different “Safari extensions”, it’s just clutter not a limitation. It requires no permissions up front and later permissions only granularly and rarely, for me only on YouTube, while the Firefox version does require unrestricted access to all domains. I have never seen a “dynamic filtering capability” it lacks or an ad it can’t block, do you have any examples?