I have downloaded a whoppin' whole entire RTB archive from a website that goes by the name of swololo (yes, that is really the website name.) It's about 0.9 GB (999.06 MB). And if you have that whole RTB archive downloaded, it should be faster upon loading next time.
The thing is just I don't understand why there is an datablock limit, and I know you don't want to be sitting hours for 9000+ addons to download, but hey, if you downloaded that whole RTB archive, then it should be faster then!
(only if you have good internet)
The fact that it's nearly 1 GB proves our point even more. No one wants to sit and download that much.
You aren't even going to be able to make a good server with every single add-on. There's no good use for it.
If you're hosting a DM, use a small selection of weapons with a common theme, preferably matching the theme of the build, with their mix of strengths and weaknesses.
If you're not hosting a DM, then you don't need any weapons. They don't add any value. No one needs people pointlessly shooting them in the face while they're building.
Vehicles don't really add value to most games.
If you need vehicles for a gamemode, use a small selection of vehicles that fit together. You don't need every single one.
Find a decent selection of brick packs.
Downloading every single one just clutters your brick menu with redundancy and stuff you'll never use.
Music is just tacky most of the time. Maybe one or two files to add some ambiance to the build.
Grab a couple environment files to create the look and feel your build is going for. You don't need to continuously change it.
