Sorry to come to this discussion late.
Science does recognise intelligent design. Science recognises that both Stonehenge and the Eiffel Tower are designed. Questions about ID are more usually about the Discovery Institute version of intelligent design in biology.
From a scientific point of view DI-ID is a hypothesis: “Complex systems require intelligent design.” The problem is that they have not advanced much from their basic hypothesis to make predictions: “If our hypothesis is true then we should observe …” Not having made any predictions as to what should, and what should not, be observed then DI-ID cannot make further scientific progress. Moreover, it is necessary that ID makes a different prediction to evolution, otherwise science will revert to the simpler explanation: evolution.
For example, Einstein made predictions as to what would be observed about starlight during an eclipse, ahd his predictions differend from Newton’s. Those predictions were confirmed by Eddington’s observations in 1919. DI-ID is not yet in any position to perform such experiments since it has no predictions to test.
DI-ID asserts that a certain level of complexity requires design. That leaves open the question of how complex their proposed Intelligent Designer is. If it/they are intelligent then that might imply that there is an infinite regress of intelligent meta-designers needed to provide the required complexity in the Intelligent Designer. Alternatively, intelligence does not reach that level of complexity, and so can arise in the absence of design, in effect that intelligence can evolve.
DI-ID would like to be science, but all too often it drifts into theology. For example, it usually assumes a single designer, rather than multiple designers. Why not one designer (or design team) designing gazelles to avoid cheetahs while a different designer designs cheetahs to catch gazelles? Those very obvious theological assumptions still present in DI-ID will put off scientists; theology is not science.
In short, DI-ID still shows its theological roots as an attempt to get creationism taught in US public schools. It has tried to look like science, but is failing. The DI-ID journal
BIO-complexity has published three articles so far this year! That is a major indicator that DI-ID is not doing science but is doing something else.