One inconvenience I have noticed is any plugins setup within Sublime Text are not loaded for the first few seconds. I generally cannot jump straight into the Command Pallete and must wait for them to load.
Is it currently possible or feasible to add a “wait for load” option? Meaning Sublime Text does not display until all (or select) plugins have been applied?
Not really, no; the point of the operation being async in the first place is so that you can start working without waiting for your plugins to load.
I may be a unique use case where I’m evaluating XML frequently. I need indentation often so even though it may open faster than another XML viewer I have to wait on the plugin. Which is why a specific list was mentioned.
Just wondered if I was missing something but I understand my use case is niche.
How’s it related to plugin loaded? The usability of command palette before plugin loaded is a little annoying indeed. If you need a command so often, you can use a keybinding for it instead hopefully. And keep pressing it 
Just wondered if I was missing something but I understand my use case is niche.
No, you missed nothing.
A potential solution would be to not quit Sublime frequently; plugins only load at startup, so if it takes a while for your packages to load at startup you could mitigate it somewhat.
Plugin are loaded in dictionary order irrc, so theoretically you can have a zzzzzzzzzzzzzzzzzzzzzzz py33 plugin to hint you ST has all plugins loaded.
I was going to suggest the exact same thing. (well, perhaps without the last word…)
Or just, y’know, have a plugin to auto format open(ed) xml files without requiring any user action