If youre going to get an avalon, you should definitely own a cartridge or two.
The convenience of not having to switch on euro and mess with wires is a huge plus.
Also, the whole point is to have the filter interact with the sequencer - its a huge difference to using any eurorack sequencer.
For example, I own both a TVS Pro and Oberheim SEM (currently for sale in the ads section), and I have never been compelled to use their filter because the SEM cartridge sounds great and I love using it with the modulation coming from the sequencer onboard.
Hereās mine, in a 1 of 1 colour scheme, sitting in front of the Cirklon for instant jamming