With a quality crimping tool, many are not, there is no room for solder to flow in the crimp band area. Heck I placed sugar in the head of a lug, crimped it, dumped it into a glass of water and let it sit for months, the water actually evaporated because I forgot about it. I drilled into the lug and the sugar came out...

If you are using tinned closed end heavy duty lugs and the proper crimp tool (not hammer or staking type but a 360 degree compression swage type) there is no need for solder... If you use sub standard crimp tools then solder will flow in.

This is even true on standard small crimp terminals, if the correct tooling is used. Here that the terminal has been soldered yet solder did not pass through the crimp band and create the proverbial hard spot. If we listen to the leaders in the industry, AMP/Tyco/TE Connectivity, soldering only serves to degrade a termination like this and is actually not recomended on top of a proper crimp. Key words there being proper crimp....