When you compare the features and prices, on the one hand with eurorack mixer modules, and on the other hand with external mixers, things quickly become clear... But, especially in 'live' situations, it is difficult (or sporty :) to do without a mixing solution in the modular itself.
For my part, I adopted the following solution: if I want to stay warm, comfortably snuggled up on the modular side, it is a set of modules that will allow me to mix. Mono and/or stereo submixers (Doepfer A-138s and Befaco StMix), then a final hub (Erica Synths Black Stereo Mixer V3), and finally an output module (4ms Listen IO). Some other modules, which can be useful for other tasks, come in reinforcement if necessary (DivKid Mutes, Intellijell Tetrapad and Planar, Vcas, etc.)
If things become more serious, I believe that only an external mixing via a DAW, for example, will allow to work with precision (with Eqs, volume or filter automations, compressions, etc.) In this case, a module like the Expert Sleepers ES-9 (or ES-8) will be useful.
Everyone may freely work in their own way, only the pleasure of playing, and the result (sometimes also ;) count.
'On ne devrait jamais quitter Montauban' (Fernand Naudin).