This is correct. I remember showing friends Chrome after hearing their complaints about how slow IE was. Some had to get over the hurdle of downloading and installing chrome (whereas IE just came with the laptop) but once they used it they never looked back.
That's just wrong. It's impossible for uBlock Origin to turn itself into a content blocker while retaining its current functionality.
Content blockers in Safari are limited to 50k filters. uBlock Origin's default filters have more than that. Therefore, the choice is between a new, but much less useful extension, or no extension at all. uBlock Origin decided on the latter.