I am not an isolated example at my work and as a result we have lost some excellent talent. Is this happening at other companies or is mine an outlier?
Outside of this problem I really like where I work and the people that I work with but I feel that I may need to move on if I want to advance my career. I can't think of a way to address this problem with the higher ups without torching my future further.
We also have a policy of ensuring that we have no single point of failure when it comes to technical or institutional knowledge. Our tech work community is really good at ensuring that we keep others in the loop and document everything.
Non-management positions are subject to a union collective agreement. The money is good mind you but there are no raises outside the pay grids.
Also, if you watch closely, there will be professional development opportunities. These usually include some kind of training through your workplace. In addition, there are committees sometimes. These can create connections in the workplace. Being connected makes you more visible and promotable. This includes conference attendance. The objective is to meet people and make your company look good.
There are also programs that offer training. Things like Verizon Skill Forward which gives a year of training for free or if you pay for like administrative certificates. Check to see what your job offers for education credits. How much will they pay for and what will they guarantee if you do the training.
There is also the question of side projects. Some workplaces encourage inventiveness or side projects which show you can do things for the company. There are ways to do things.
Are you taking leadership responsibilities? Leading your team, mentoring others, representing your team in broader meetings with other teams, helping with planning, etc. Doing that stuff probably means you stop doing technical stuff.
I have also taken the company recommended leadership courses.
I agree with the others that sometimes the path for career advancement can be to move on elsewhere.