Indirect fire being one of UKF's gaps isn't a huge issue to me. If you really need rocket artillery the Land Mattress doctrine is there, but otherwise the base artillery does the job just fine for attacking static positions. You can always sneak a sniper close to the position if you can't approach with a Pyro Section, which is even easier to use with the smoke drop.
Sneak your sniper to the Howitzer. Man you are good ;-)
The problem with the base artillery is the red smoke. You want to thin out a defensive position? This only works for flak emplacements, bunkers and OKW trucks. The team weapons, tanks and infantry already withdrawed a little bit to get some space between them and the shells (unless opponent is afk of course).
So it is more of an area denial if you use it versus mobile defensive positions.
Always playing that one landmattress doc? No, thanks. That is exactly the point I don't want at any faction.