Lugia is 100% correct and I learned the hard way well at least my 6u Doepfer A100 Starter system was helpful to learn the basics but I ended up expanding to a monster case that really gave me breathing room and then added tools and support modules.
However with that said, new polyphonic modules like Knobula Poly Cinematic and paraphonic modules like Acid Rain Technologies Chainsaw and the Supercritical Demon core oscillator give me hope to at least add to a polyphonic type setup in modular but it still costs way more since you need a good sequencer which is expensive as well as nice big mixer, support modules, effects and so forth. Heck the Waldorf Iridium is a bargain compared to how you will end up spending 5x to get close in Eurorack. If polyphony was a hard stop for me, I would get the Waldorf, Prophet 6 or Access Virus TI2 and a cheap drum machine and be done with it. Same goes for modular drums, very expensive!