My point was that the scanline approach simply wouldn't scale with the rapid development of technology during that period and would sooner or later cause more issues than Nvidia's multi-GPU approach did. Though even that was a complete failure and would cause more issues than it would fix. Ideally you'd have a system that seamlessly combines computing power of multiple GPU's where the software doesn't need to be tailored for it, but, you know, pipe dream, especially with how Nvidia killed off NVLink in consumer GPU's for them to not eat into their enterprise products.
Besides, nowadays the more viable multi-GPU setup is having an AMD APU, a beefy Nvidia GPU and a small Intel Arc GPU so that you can use the benefits of all three vendors in games, like FSR/XeSS, AFMF, QuickSync etc while having a main GPU that's actually powerful and worth a damn. Another reason why Nvidia ditched SLI was because they started making single GPU's so powerful there was no need to try and combine multiples of them to reach higher performance, basically wasn't economically viable to do this type of voodoo anymore as everyone moved onto better processes.