Now I've to download a VM and install both systems on my PC (pollution), configure VM interfaces (conflicts) and I'm connected to a live environment. I don't like that!
I don't understand you. VM = Virtual Machine, right? So you download CHR, which is fully functional RouterOS. It's completely free, only limited to 1Mbit/s, but otherwise you can test any config you want. And if the speed limit would be a problem, you can activate trial license, which doesn't have time limit and just doesn't allow further upgrades (to leave at least some motivation to eventually pay for it). You can get as many of them as you want and create any virtual network structure to play with. There's no pollution, it's just few directories on disk, you can delete them any time you decide that you don't want them anymore. You can create as many purely virtual networks isolated from everything else as you need, there are no conflicts. But you can also do all kinds of crazy combinations of real and virtual networks, if you want. But you don't have to, it's completely optional.
Just erase and flash an image to a Raspberry SDcard, plug in it.. boot it up..go to the GUI and just play around. And if you break something, just start over!
And it's easier than VMs how? Backing up or restoring VM with CHR takes about five seconds. Try that with Raspi's SD card. And what can you test with Raspi anyway? It has one ethernet interface. You can connect another to usb, but how many of those has regular person lying around? And testing anything more complex, again, how? With several Raspis, usb network adapters, etc? Yeah, that sounds really practical.
And don't forget, it would be regular RouterOS, similar to current x86. With that, free options include unlimited features for 24 hours and then you'd have to reinstall everything, or severely limited L1 license. Next step is $45 L4 license. Of course MikroTik could do something about it, to make it more attractive, but why would they want to? To ultimately sell two hundered RouterOS for Raspi licenses world-wide? Remember, Raspi is great, because you can install anything. If you installed RouterOS, it would not allow you to install anything else. Why would anyone do that?