Por que um serviço não pode ser inicializado na inicialização

Eu quero usar systemdpara fazer uma inicialização de serviço na inicialização. No entanto, recebo a mensagem dizendo que o serviço está inativo (morto):

root@mdchost:/lib/systemd/system# systemctl status mdc_freespace_vldy_fusion_node.service
● mdc_freespace_vldy_fusion_node.service - MDC Freespace Vldy Fusion Node
   Loaded: loaded (/lib/systemd/system/mdc_freespace_vldy_fusion_node.service; enabled; vendor preset:
   Active: inactive (dead) since Sat 2018-08-04 01:06:48 BST; 5min ago
  Process: 3841 ExecStartPost=/bin/bash /usr/bin/mdc/base/set_limit.sh FUSI mdc_freespace_vldy_fusion_
  Process: 3838 ExecStart=/usr/bin/mdc/fusion/mdc_freespace_vldy_fusion_node (code=exited, status=0/SU
  Process: 3090 ExecStartPre=/opt/x86/ros/kinetic/bin/rosparam load /etc/mdc/fusion/kinematics_dynamic
  Process: 2266 ExecStartPre=/opt/x86/ros/kinetic/bin/rosparam load /etc/mdc/fusion/freespace_vldy_fus
 Main PID: 3838 (code=exited, status=0/SUCCESS)

Mas eu posso fazer a inicialização manualmente executando o comando:

systemctl restart mdc_freespace_vldy_fusion_node.service

E agora o status do serviço se torna ativo (em execução):

root@mdchost:/lib/systemd/system# systemctl status mdc_freespace_vldy_fusion_node.service
● mdc_freespace_vldy_fusion_node.service - MDC Freespace Vldy Fusion Node
   Loaded: loaded (/lib/systemd/system/mdc_freespace_vldy_fusion_node.service; enabled; vendor preset:
   Active: active (running) since Sat 2018-08-04 01:29:31 BST; 1s ago
  Process: 2065 ExecStartPost=/bin/bash /usr/bin/mdc/base/set_limit.sh FUSI mdc_freespace_vldy_fusion_
  Process: 2017 ExecStartPre=/opt/x86/ros/kinetic/bin/rosparam load /etc/mdc/fusion/kinematics_dynamic
  Process: 1991 ExecStartPre=/opt/x86/ros/kinetic/bin/rosparam load /etc/mdc/fusion/freespace_vldy_fus
 Main PID: 2063 (mdc_freespace_v)
    Tasks: 6
   Memory: 3.5M
      CPU: 469ms
   CGroup: /system.slice/mdc_freespace_vldy_fusion_node.service
           └─2063 /usr/bin/mdc/fusion/mdc_freespace_vldy_fusion_node

Aqui está o meu arquivo de serviço:

[Unit]
Description=My Node
Requires=start_roscore.service
After=start_roscore.service

[Service]
User=mdc
Group=mdc

Type=simple
KillMode=proces
Restart=on-failure
RestartSec=16
StartLimitInterval=0

EnvironmentFile=/usr/bin/mdc/base/env.cfg
EnvironmentFile=/usr/bin/mdc/ros/ros.cfg

ExecStartPre=/opt/x86/ros/kinetic/bin/rosparam load /etc/mdc/fusion/freespace_vldy_fusion_config.yaml
ExecStartPre=/opt/x86/ros/kinetic/bin/rosparam load /etc/mdc/fusion/kinematics_dynamics.yaml

ExecStart=/usr/bin/mdc/fusion/mdc_freespace_vldy_fusion_node
ExecReload=/usr/bin/mdc/fusion/mdc_freespace_vldy_fusion_node

ExecStartPost=/bin/bash /usr/bin/mdc/base/set_limit.sh FUSI mdc_freespace_vldy_fusion_node