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You might be right, just all the bifold installs I've watched online the first step is to run a bead of silicone where the threshold will sit and then install the threshold and away you go. So I was a bit surprised to only find a few packers and fresh air.
I guess I'm trying to figure out what's best practice so they don't just brush off any questions in order to get it done faster.
ILb
Lack of seal shouldn't be a problem - the design should be such that water is not getting down there in the first place. Sealant should be the defense of last resort, not the front line. You could always put some sealant in there is you're worried, I suppose.
Worth checking with the builder / installer in any case. And with the manufacturer, as they will likely have specific installation instructions.
Is the DPC a problem? It's not as if the bifold can get damp. There seems to be plenty of room to wedge it through though.