You don't need a grid forming inverter to re-synchronize with the grid, you only need a grid forming inverter if you need a complete cold start or to support a grid island.

In the context of our discussion, adding more capacity, that's exactly what's needed here. We're not replacing 100% of energy sources with solar, we are replacing energy sources with _renewables_ which is hydro, solar, wind, arguably nuclear as well.

Even extending your argument to "well we need to only have solar" then you need a grid forming inverter with batteries. That's not a massive increase in complexity or time and supports the "just tie them to the grid" statement.

Trying to use the analogy of a nuclear power plant, which requires 10-15 years (including permitting), is ridiculous. A solar plant is 2-5 (including permitting) - by comparison.