Some good advice here, especially about taking the time with the gear you have. I cannot imagine that anyone would have a lack of creative musical options with a Deluge and a Digitone. That should be a beastly combo.
Also, related to your post, I haven’t had the urge to make one particular piece of my gear the sequencing “brain”. One reason is that I like to mix and match sequences from different devices during live performances. Also, even though the Digitakt is technically the “drum computer” of my setup, my Digitone and Circuit Mono Station can each take over the “root” musical and rhythmic duties from moment to moment, so then the Digitakt is free to take different roles than drumming.
At any moment, maybe the DN is laying down the groove while the CMS is playing a dirty analog bass line and the DT is throwing out the atmospheric samples. Or maybe the CMS is sounding like some analog modular drum thing, the DT is adding synced drum samples (hey kids, DT + CMS = poor man’s AR?) and the DN is serving up pads and a chiming melody. It’s all open season when you have more than one device that can do more than one thing.
The above isn’t meant to give the OP extra GAS over the Digitakt, but only to illustrate some of the value of letting each device control its own sequencing as a flexible creative tool. Again, the Deluge is deep deep deep, and very powerful. As much as I personally love the DT, I agree that the Deluge should cover that territory and maybe then some. The OP should definitely spend some time with the DN to decide how much the Elektron way and this form factor in particular is appealing. I went through a similar journey and because of the DN, I ended up swapping in a DT and swapped out an MPC Live. But I’m glad I spent the time both with the DN and the Live before making that decision. It was an informed choice after several months or more of creating and performing live music on the Live and the DN to finally decide the Live was overkill and to confirm that I loved the DN/Elektron way. At that point, swapping in a DT and losing the Live was not painful at all because I knew deep down what each device was all about, but a different person could have come to completely different conclusions and if decisions were made in haste, they could “hate” the DT and deeply regret giving up the Live.
tl;dr - I agree.