Library blocks 11 pin about rf24 HOT 1 CLOSED

Of course it blocks pin 11. On the ATMega328p, pin 11 is the SPI MOSI line. We can't control that. This is a detail specific to the Arduino AVR core's SPI library, not RF24 library.

It was sooo hard to determine that library prevents 11 pin from working

You could have saved yourself some time by reading the docs' landing page. There's a pinout table at the bottom.

Other resources include anything that describes the GPIO pins' capabilities about the Arduino UNO. Even the official Arduino store page would have told you pin 11 is required for SPI MOSI (aka COPI).

from rf24.