Well for a number of reasons, but for now you are right about building it myself is not necessary
1e i don't use your libreelec version, but a standard 8.2.5
2e i have a big stack of blu-ray discs that i won't be able to play on Linux without makemkv
3e if you would decide to abandon this version and so the makemkv add on i would like to be able to continue and update it myself.
4e i like to learn new things
So can and or will you give instructions to update the makemkv add on?
And it is absolutely not the case that i don't trust your work!