Is Placing of Public Notice under Order 5 R 12 CPC Unnecessary?

Bhai log, main toh pata nahin, why bade-bade lawyers hain kya? CPC mein aise rules hain jo koi samajh nahin sakta. Take example of Order 5 R 12, jo ki public notice ke baare mein hai. Yeh kya, agar public notice lagata hai to koi bhi party us court ke notice ke peechhe aane ke liye nahi paa sakta? Aur agar na lagata hai to us court ke baad koi party appeal nahi kar sakta. Kya yeh rules necessary hain? Agar hain to kya justification hai iske peechhe? Kya yeh rules kaafi complex hai? Main kahunga ki yeh public notice ki jarurat hai, lekin bas kuch specific conditions mein.