You have to read these articles with a grain of salt. Every paper will have bias. It is true that European bees which make up the majority of the honey producing managed hives are alien species. There are native bees as well and other alien bees that pollinate a range of flowers. Many of these other bees may not live in colonies (solitary bees) and they don't all produce honey. Many insects and birds specialize and prefer specific plants and flowers and even colors. Sometimes they are direct competitors for nectar, but not always. Some flowers are designed for a specific pollinator.
Just as all bees do not make honey or live in huge colonies, not all bees compete with natives for food, or habitat. When you think about it if you went outside or to the mall or grocery store you will find a lot of 'aliens' everywhere. From the Egyptian cotton linens, to Brazilian coffee, to the flowers native to China, Japan, South America, Philippines, Africa and Europe and all points everywhere. Most of the melons, squash, almonds, Macadamia nut, mango,plums, peaches, nectarines and others would disappear from the market if there were no bees to polinate the flowers.
I think what people do not realize is that bees are not the only pollinators around. Butterflies, flies, moths, ants and beetles can also polinate flowers. Most plants that spend their lives deep in the forest or jungle where there is little light, depend on other pollinators besides honey bees. Leaf cutter, carpenter, and some species of bumble bees are solitary. Some feed on nectar, but the leaf cutter bee gathers leaves to line their nest and they live offf the fungus that grows on the leaves. There are native bees around. We used to have a native bee foraging with the honey bees in the herb garden but I haven't seen one in a long time.
Pollinators often specialize. Bees rarely polinate tubular red flowers. Those are pollinated mostly by butterfies.
The carpenter bees are partial to tall purple flowers of lavender and verbena in my herb garden. the fiery skipper butterfly likes the sage and the Italian honey bees like the basil and the orchard flowers when they are in season. Monarchs exclusively feed and live on milkweeds.
There is no doubt that alien species introduced to areas, especially where native species have carved out a niche without competition can do serious damage to a fragile ecosystem. This is especially true of unintentional introductions of pests and plants into an environment where they have no predators to control them. They can displace the natives by out competing them for food and habitat. Native species also become 'dinner' for the aliens especially if they evolved without the need for defenses from predators.
To save our polinators and the bees, both wild and managed, we all need to preserve and create habitat for them and reduce the use of pesticides which kill indescriminately. We also need to be careful what we 'aliens' we bring home to make sure they don't become a future problem.
Happy gardening in Hawaii. Gardens are where people grow.