There is nothing wrong with applying the correct glue to decking installations.
Positives:
This will provide a sound and comprehensive installation.
This technique will remove the chances of board creek as the deck ages.
This will reduce the movement of the boards.
This is usually for higher end projects where you can charge for extras like these.
Negatives.
Probably advised to use glue as the fixings are plastic? (not strong enough to hold the deck for most hardwoods)
Cost more to install, as you can’t use cheap glue as this would be a pointless exercise most glue for this installation would be approx £8-12 plus vat per tube…and usage rate approx 1 tube per sq m.
Can’t take deck boards up easily, if at all.
Hope this assists.
cheers
Karl