lfos are not utilities - they are modulation sources
utilities are things like (but not limited to) vcas, mixers, mults, switches, attenuators, offsets...
whilst maths does have some of these functions integrated into it, I find that it is best to see maths as it's own thing (the sum of the whole is more than the total of the parts - see the maths illustrated supplement for details) and duplicate the utility parts (attenuversion/basic mixing) as you will need them sooner or later - they are inexpensive, especially if you buy doepfer for example
"some of the best base-level info to remember can be found in Jim's sigfile" @Lugia
Utility modules are the dull polish that makes the shiny modules actually shine!!!
sound sources < sound modifiers < modulation sources < utilities