Reservoirs are always worth it.
The beauty of this setup, is that if I ever decide to add them, I can just get the cap, hoses and reservoirs and upgrade to remotes.
I have just never been in a situation offroad or on road where I thought: "My shocks are fading" and I have always used the regular jeep suspension design with an emulsion shock.
I will even admit that the shocks on this jeep have never been replaced. They are factory, and I have never felt the need to replace them, as they still hold oil, and work as designed.
Leaving the suspension stock would probably be fine with me, but going to a coil over simplifies the setup, and allows me to rebuild with readily available seals when needed.
But yeah, if I am wrong, and I decide to add them later, I will just have to pay the $ and upgrade.