You still need the probes to mask some of SSGI’s problems, so it’s still going to be slow, awkward to set up, and prone to a number of new artifacts in addition to the old ones.
Look, I’m not saying it’s going to be entirely useless, and I guess it has the saving grace of being easy and fast to get meh results. But there’s no path forward with SSGI. You can’t invest more computer time or even artist time for better results. The problems with it won’t be solved in the future. It’s a dead end.
None of them are perfect, but almost all are better than SSGI, so pick your poison:
In addition there’s some quite old techniques like virtual point lights or irradiance caching that aren’t really realtime but would still fit the bill for Eevee. Well, they wouldn’t be great, but still better than SSGI.