I often have to provide proposals and quotations in response to customer's tender documents and in the last six months I have seen three such tenders specifying tight-buffered fibre for their internal networks. When I push their staff engineers for a justification they "um and err" and are easily persuaded to do the right thing (i.e. use spliced loose-tube fibre). If you need to read up then I've written a few things in the past.
Last week I came across the following from the Argosy website;
Tight buffered cables are intended for indoor applications. They are more hardwareing than loose-tube cable, as such they are well suited for long indoor LAN connections, burial or complete even submersion in water. Tight buffered cables have a special two-layer coating. The first layer is plastic, the other a waterproof acrylate.I wonder if this mis-information is their doing?