If its lighter than any else antivirus on market and can compete even , it would be beast agaisnt other competors, and cylance + cf would be as good as any other av + cf
Remember though, this is the Smart Anti-Virus we're discussing... which is extremely limited and misses a huge range of attack vectors. It's a simple Anti-Virus relying on ML/Ai models through data-set training, therefore it could be a nice companion alongside other software (or hardware appliances like UTM). I would personally use it as a companion if anything but at the end of the day it is down to you and your needs.
A lot of Cylance competitors (speaking generally here on the AV/IS market and not specifically about ML/Ai technology) have a lot more packed into their home market solutions for home customers. This ranges from Host Intrusion Prevention System (HIPS)/Behavior Blocker (BB) to WFP-based network filtering (network signatures and firewall) and all the way to emulation, safe browser, cloud reputation lookup, etc. Important things to note, as already noted on the forums, is the lack of support for scripts and WOW64 process scanning.
In short, there's usually more going on in the background with solutions from vendors like Trend-Micro, Norton, SOPHOS, Kaspersky, ESET, Qihoo and others. At-least when the protection components are all enabled and working on conjunction with each other to provide the home customer with a solid layered protection approach (e.g. signatures and heuristics for traffic filtering and file scanning, cloud file reputation lookup, behavioral layer for emulation/HIPS/BB, potentially a roll-back feature should the customer still get successfully hit with ransomware and not have a backup of their own, etc.).
If Cylance Smart Anti-Virus wasn't "lighter" than most other well-known and reputable products then I'd be quite worried. The enterprise version of Cylance is far better than the Smart Anti-Virus and covers the customer against a wider threat surface though, so it joins in the competition a bit more with that.