Well, there are other reasons to use it: Its crafting speed, its automatic loaders, it size which supports more belts and more beacons, its more efficient use of productivity modules because of its speed.
But fewer module slots means less productivity and I could see that trumping all other concerns.
Honestly I feel like I'm already putting in almost a game breaking amount of slots. How would you feel about a more restrained proposal: I'll add logic that says IF bob's mod is installed, then I'll up the whistle stop assembly machines from 5 to 6 so it'll tie bobs.
Is that enough that you would use them? Do you feel it needs to be 7 or needs to be configurable? Also, is bob's assembly machines the only thing that you've seen beat my mod in number of modules? If that is the case I may just try to detect the presence of Bob's Assembly Machines mod specifically to key off of.