The point is that you are talking about an implausible scenerio as a means of supporting your contrariness. I am left with the very strong impression that you have never used a dado head - because if you had you would have a greater understanding of its' strengths and weaknesses and also of the potential hazards surrounding its' use - instead nada, nothing constructive; you don't seem to have much understanding of handling large, heavy sheet materials, either - do you seriously think it feasible to man handle 250 oversize sheets of 75kg plywood across a saw?
This is borne out by the following comment:
Again, 250 sheets x 75kg, or a tad under 19 tonnes. Yes, I'm sure someone will want to man handle that. Not me, though. In the last two days I have measured, cut and fixed just over 1.5 tonnes of fire rated flooring. Granted no board was moved more than about 30 feet, and the boards were a mere 46kg each, but with even that small amount I was cream crackered - good job I had an easy afternoon today. And you think passing 19 tonnes over a saw is doable. What the blazes are you on?
Then you talk about taking two passes to make a wider cut. So, having used your FLT to load the sheet onto your saw, done the required test cuts to ensure that the trench is in the right place, you then push the first sheet across the saw making a 15.5mm trench (you can't use the sliding carraige for the full cut because it is too short and in any case doesn't have the 3.2metre/10ft stroke you need to make the full cut on it). Having made the first cut, you then lug the sheet off the saw and take it back to the front of the saw, where, before you finish the cut to full width you need to reset the rip fence to get that extra bit of width. Of course you then need to load the sheet again and make the 2nd cut, hoping to hell that the fence is now in the right place (because, of course, the fence rule is only graduated in 1mm increments and rip fences don't feature detents or fixed stops unless you have a digital rip fence). Then you have the problem of getting the rip fence back to its' start position. This again can be ever so slightly inaccurate (unless you have a digital rip fence, again) And if you know anything about housings, it should be obvious that as soon as you move the fence that accuracy goes out the window - housings need to be a snug fit, not too tight and never sloppy.
All I can say us don't give up the day job - but if you are in construction or manufacturing, maybe you should consider it
So instead of all this attempted point scoring, do you think you could manage a positive contribution to this discussion so we can get things back on track?