According to Stockfish, chess would be more equal without castling. (+0.4 w/castling enabled, +0.1 w/o castling) : r/chess

Stockfish 16 (4.2K Elo) Played an Epic Chess Game with Magnus Carlsen without Rook, Chess

0 Elo VS Stockfish

The engine is inaccurate - Chess Forums

Chessbase's engine correlation value are not statistically relevant and should not be used to incriminate people : r/chess

What is No Castling chess? - Chess.com Member Support and FAQs

PDF) Learning to Play the Chess Variant Crazyhouse Above World Champion Level With Deep Neural Networks and Human Data

Dissecting Stockfish Part 2: In-Depth Look at a chess engine, by Antoine Champion

How To Castle In Fischer Random Chess (Chess960)

Is castling in chess possible when the king is in check and there are no moves left without castling? - Quora

stockfish - How many moves out do the static board evaluations use? - Chess Stack Exchange

Stockfish (chess) - Wikipedia

Why is Stockfish better than other chess engines? - Quora