This is essentially a story about front-line traditional desktop support/sysadmins at a public university.
It's not going to be the same story at much higher paid shops where workers often have equity, good benefits, and the market has provided access to other jobs if you lose yours (in my experience, there are still shortages of qualified and competent engineers).
I would like a different method to deal with the pitfalls, but the politics, drama, overhead, and costs of unionization just don't interest me. I'm not interested in being at one job for life.
Being in a union isn't about being at one job for life. I'm a member of IATSE (the huge mega-union behind thousands of technical job titles/positions in the entertainment industry, such as film editors, sound mixers, etc; really it's many mini-unions acting as one.) There is really no connection to belonging to a union and being stuck in one job title, in fact the incentives are set up in the opposite direction - the greater the group of people the union represents, the more mobility (and many other benefits) its members get.
You should revist your stance on unions and start by reading up on how they work and what benefits they confer. Assuming you are not in the 1%, a union almost certianly would benefit you. It is a way of equalizing the playing field when the interests of BIG capital conflict with the quality of life and meaningful human experience of individuals.
Financial equity, benefits and opportunities at other companies in my experience are not the determining factors for tech workers. Lack of or loss of self-determination and self-governance are.
The tech workers who are unionized that I know didn't join for financial gain because there is none (except for a few who are bad at bargaining). They joined to exert control over their workplaces and help build companies they can be proud of.
If anything a union would aid job mobility. And theres no reason you cant still individually negotiate and receive equity if you are in a union.