Having separate services does add additional overhead and maintenance, but it does provide the benefit of 1) Reducing the blast radius if issues occur, allowing

Having separate services does add additional overhead and maintenance, but it does provide the benefit of 1) Reducing the blast radius if issues occur, allowing for a degraded service instead of being totally down, and 2) Better scaling/ optimizations. For example, one service could need to support more TPS, or need more memory, CPU, etc.