LinuxCNC vs GRBL

I've built a CNC router that I've been using for the last year or so and have been fairly happy with. Its currently running off a GRBL with Bcnc which seems to work well. I'm contemplating doing a pretty substantial upgrade (new frame/spindle) on it, and am kicking around the idea of switching to a Mesa ethernet card and LinuxCNC.

I'm trying to understand what the benefits of LinuxCNC would be, and am surprised that there isn't more information comparing the two. LinuxCNC obviously has alot more functionality, but for a simple 3-axis stepper based router I'm not sure I need any of it.

Are there any compelling reasons to switch?

Backlash compensation.

Threading and rigid tapping aren't too important for a router, but here are a few things that separate a cheap router from very nice machine.

Tool compensation (not just length but diameter as well)
Tool table
Multiple work coordinate systems
Automatic tool changer
Automatic tool length measurement
Probing
Closed loop feedback
Absolute encoders (never need to home)

Plus the ability to do anything you want because the Architecture allows you to easily write a component and install it in hal where it is treated as if its part of the core code.

Plus having enormously more power in the PC architecture.

Granted you can modify the Grbl Arduino Source but if you approach it from looking at what Grbl can't do like I did when choosing a platform, you would never use it in the first place.. I didn't anyway despite being an Arduino fan. Maybe for a small 3D printer....

Unless you have the skills of The Woz there’s not a great deal that can be added to grbl.

The downside of Linuxcnc is that it’s on the big scary Linux platform that is so hard to learn and only neck beards who live in their mums basement, because upstairs is for the cats, and live on sugar, salt, oil and spuds.
Na Linuxcnc is flexible, but you have to spend time learning.

Thanks for all the replies!

Looks like there are a ton of great features on LinuxCNC, but nothing that would really benefit my CNC. I'd love to have an ATC,closed loop and tapping, but its not in the cards for now. Alot of the features (probing, tool changes, tool compensation, coordinates systems, 4th/5th axis) can all be handled by some of the grbl forks or the g-code senders as well.

I'm also looking for a plug-and play system, I don't want to spend my time customizing or mucking with the software.

You don't "need" to do any customization. Especially for a simple mill or router. (It is just nice to have the option when there is that one little thing that you want that doesn't fit the "norm".) Besides you can't beat the price, when all you need is some old PC you probably have gathering dust in a corner (or can dumpster dive) and a $5 parallel port breakout board. I think setting up a basic parallel port stepper system in Linuxcnc isn't much different or more complicated than doing the same in Mach or GRBL. The difference is that you aren't locked into just that one simple way.