Comment by stinos

None seem to show a vast preference

That might be some kind of observation effect. Which isn't surprising either: there are various species out there which have a distinct preference for, or even visit only, one specific family of native plants or even just one particular plant. If those plants are already less common to begin with (due to various reasons, unfortunately often human-induced) there's a lot less chance you'll ever get to see the insects which rely on those plants. Just 2 of the many examples for Western Europe which are in decline and becoming hard to find are Andrena hattorfiana haemorrhoidalis and Andrena pandellei. You'd have to be fairly lucky to just see them in your garden, you'd already need to pay attention to now mow the plants they're after at the correct time, if you already have those to begin with. Likewise the more generalist insects who visit a wide range of plants will be much easier to witness.