Thankfully Maths can also be a VCA/ Mixer if I ever run out. 
Often I use the Aikido as a distortion. It’s sort of like the Grandmother mixer where past 12oClock it starts distorting but it’s far more aggressive on the Aikido. The two are also linked up so functionally it’s one 8 channel mixer with lots of routing flexibility. Plus the side chain and spectral envelope features are a lot of fun.
In general aikido also takes the sub mixer roll where tang is the main mixer before going out. I do with there was CV to the panning on Megatang but I do like the send and return feature on it. Kinda want the expander for it so I could route the MFX and Timiszoara to two different sends but not a priority.
I will use maths as an oscillator from time to time. Usually just sampling it into Assimil8or though to free up Maths for other roles.
Assimil8or really does so much that I don’t feel like I need anymore. It can do single cycles, drum hits of course, weird drone shit, sample CV.
It can do wavetables by adding single cycle oscillators to each of its 8 tracks you can link the tracks together and then cross fade between them. Even do it in stereo, though you lose resolution from 8 cycles to 4 of course. Example of that here, video not mine.
But I’ll admit I was baiting a bit here cuz there’s more gear surround the rack lol.
I’ve also got an Analog 4, Moog Studio 3, Hydrasynth, Matriarch, Minibrute 2s, and Grandmother nearby so no shortage of sequences, modulation, filters, prcoessing, or analog oscillators nearby. This also explains why I have that many mixers (despite those synths also having mixers themselves).
Originally in my mind I wanted to have one of those standalone space ship eurorack setups that did every voice in rack but quickly learned that I’d rather do drum duties elsewhere and I really wanted to leave all my synths for sound design. And instead of thinking of each synth having their own “duty” (one synth being my Pad / Chord Machine while the other does basses and leads) I narrowed down what I wanted so that I could have everything integrate and process each other if I wanted.
And a lot of it started as simply modules that helped improve the matriarch. Even if it’s simply giving samples of different flavors of noise or oscillators from the Assimil8or to replace (or add to) the Matriarch. Or do wild things like sample the Matriarchs oscillator and copy that to all 8 channels of the assimilator and send it back through the matriarch to get 8 oscillators in it rather than just 4.