Why is the default value of the SDK client grpc "MaxSendMsgSize" inconsistent with the server grpc "MaxRecvMsgSize"?

The server grpc "MaxRecvMsgSize" iuses the default value of 4M and is not rewritten, but the client sdk grpc "MaxSendMsgSize" is rewritten to 128M. What is the reason for this?

server:

func NewService(
	server *grpc.Server,
	serviceConfig *configs.Config,
	visibilityMgr manager.VisibilityManager,
	handler *Handler,
	logger log.Logger,
	grpcListener net.Listener,
	membershipMonitor membership.Monitor,
	metricsHandler metrics.Handler,
	healthServer *health.Server,
) *Service {
	return &Service{
		server:            server,
		handler:           handler,
		visibilityManager: visibilityMgr,
		config:            serviceConfig,
		logger:            logger,
		grpcListener:      grpcListener,
		membershipMonitor: membershipMonitor,
		metricsHandler:    metricsHandler,
		healthServer:      healthServer,
	}
}

client:

defaultMaxPayloadSize = 128 * mb
...
opts = append(opts, securityOptions...)
opts = append(opts, grpc.WithDefaultCallOptions(grpc.MaxCallSendMsgSize(maxPayloadSize)))
opts = append(opts, grpc.WithDefaultCallOptions(grpc.MaxCallRecvMsgSize(maxPayloadSize)))

Start by locating the server NewService entry point and the client code containing defaultMaxPayloadSize and the grpc call options. Compare how the server MaxRecvMsgSize and client MaxSendMsgSize defaults are configured; done means the reason for the difference is established and clearly recorded.