Probably GAS, but the genres you mentioned might be more suitable to a sampling workflow. Lo-fi often uses electric pianos, guitars and other live instruments including drums. You can sample those into the digitakt. D&B often uses sampled and chopped drums.
Before you spend a fortune, though, check out Syntakt’s presets to have a better understanding of the sounds it can make.
I think people ask way too much of the Syntakt’s instruments. The Syntakt is a collection of 12 highly flexible monosynths. Those monosynths all sound better when post-processed and mixed in a DAW. You can go a long way as a standalone groovebox, but only so far.
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