Updated: 29th January 2021
The short answer is:
Yes, like other invertebrates, bees are part of the whole interconnected web of life that makes up the ecosystem, with each living organism playing its own part.
You'll often read about the valuable role bees (and other insects) play in the process of pollination - a commonly quoted statistic is that bees pollinate about a third of the food crops we eat. Whether or not we can accurately measure how much food bees pollinate, I think we can all accept that bees play an important role.
Indeed, I have covered the topic of the importance of bees in depth and from a number of angles on this website.
You can read 10 reasons why we need bees - this page covers the following topics (among others):
Whilst it is true that some species are now extinct and the impact on humans may appear to be minimal, other parts of the ecosystem may indeed have been negatively affected. For example, some plants may only be pollinated by particular insect species, and demise of the pollinating insect may result in extinctions of plant life. We cannot always know in advance the wider importance and role of any species, and often our knowledge is limited.
If we are tempted to take a relaxed view of species extinction, then perhaps it's worth pausing to consider these questions:
There are many other questions we could ask ourselves too, that would touch on moral issues of guardianship, rights of species to co-exist, and balance of human 'needs' versus 'wants'. Confronting these questions honestly may be easier than implementing the answers and ideas that arise. However, we can at least play our own part by taking personal action. Raising awareness is a very good thing - taking practical action to create habitat with plants for bees is even better, and we can do that in our own gardens and yards, in school grounds and so on.