[alkonaut]

First-in-last-out isn't a good solution, it's just one of the bad solutions to the problem of firing replacable workers. The idea is that it's the starting point of negotiation, and the employer has to compensate to go around it, and that added cost to the employer is what gives more security with longer employment. It's important to note that it's very common for employers to still keep newer employees and use the compensation workaround.

[biztos]

Also, some people may not be aware that many countries have plenty of restrictions around layoffs, totally separate from the unions.

For example I work in a non-union company, and if I have children and you have none, you get laid off before I do. Regardless of who's "better" and who's been there longer. That's in Germany; I would assume, say, France and Spain have much stricter rules around layoffs.