@scottalanmiller Every system that allows third party plugins has this potential problem. Wordpress spent years getting their plugin system right, if you update Wordpress, it tells you a plugin isn't compatible, this is being worked on with NodeBB, but again, takes time to get right and develop.
The NodeBB guys have to release improvements to plugin systems etc, whether plugin developers are still actively creating plugins for NodeBB or not. Look at the number of Wordpress plugins that don't support 4.0+ of Wordpress. If a plugin for 0.5.x doesn't support 0.6.x and the plugin dev either won't update or accept a PR to update it. There's not a lot we can do about that. NodeBB guys made enough noise about the changes before releasing 0.6.x, plugin developers that are still active and developing have changed plugins to support the new system. I've had no problems updating recently, if anything, it's only gotten easier in recent months. If Server Administration is causing you a headache, NodeBB will host your project for you and deal with everything like that on their end. Leaving you with the time to grow your community. I understand your frustrations when it comes to administering NodeBB updates on your machine, but stable versions of NodeBB do work, the plugins you decide to install on them however, are at your own discretion. Notice how nearly every "update stopped my forum", or "this plugin doesn't work" topic is solved by updating a plugin, or disabling an incompatible plugin. The issue here isn't with core NodeBB.
I don't know what OS you're running, so me telling you to run ./nodebb dev may not be applicable to your OS, but whatever method you use to view the logs and start nodebb in development mode will tell you of any issues (if their are any). The issue regarding tag score and tag value in your case is to do with templates.js needing to be updated.
If you have any other issues with getting NodeBB to start, all we need is the output from either nodebb dev or nodebb log, and any issues can be resolved.