According to Jihoon Song, on the Ethereum beacon chain, both attesters and PTC can perform the IL inclusivity check, each with its own trade-offs. When attesters perform the check during attestation, the full beacon committee is utilized, but a failed check triggers a beacon block reorganization, which can reduce overall chain stability. This technical detail is crucial for ETH traders since block reorganizations can lead to short-term price volatility, increased transaction delays, and potential arbitrage opportunities. Monitoring beacon chain stability and reorg frequency is important for traders seeking to manage risk and capitalize on market movements. Source: Jihoon Song (@jih2nn)