Don
I’m not sure soil blocks are extra work vis a vis module trays. With module trays you have to fill them, press them down, refill, press down and water well before sowing the seeds.
With soil blocks you prepare the mix, including watering; create and press out however many soil blocks you want on a tray, then pop the seeds in them and pop a lid over them or not.
I don’t think there’s any great difference in time taken to transplant into the ground.
I’ve done both this year and not noticed that much difference in time to be honest. I suspect the more soil blocks you make, the quicker it is relative to modules as creating filled module trays is a linear function of time, whereas soil blocks is a bit of upfront time mixing and wetting and then very quick generation of your blocks. The time taken to prepare 10 times as many blocks is probably not much more than three times the time taken to prepare one unit.
To each their own I suspect……