Your choice of verb tells a lot about what you think of your employees.
In many cases problematic employees can and are removed from EU companies.
Also, surely if they were excellent candidates then you'd be doing your absolute best to keep them around?
Well to be fair excellent candidates are excellent on paper. It sometimes happens (not often, but not once in a blue moon either) that the candidate turns out to be completely unsuitable for the job.
You don't sound like a big company ceo. If you have a good reason, even as a small company, and revenue / affordability is one, you can fire people.
You just need to be able to pay them for min. 3 month if thats your contract length and as a business owner you should know how to calculate.
just to hammer this point home: Every mandatory employee benefit has a huge cost, and adding enough of them kills your economy. It makes it more expensive to have an employee than X many jobs can justify. That X grows every year, and that's X people who cant do that job and get paid money for it.
Meanwhile, Big tech (pre-2022) went to pretty extreme lengths to keep tenured employees around because of all the knowledge they'd built up which made them valuable to the company.
But whatevs, you do you. I'd advise you to only hire contractors if you want people to stay less than a year.
And it's worth noting that you appear to be responding to people who are in German speaking countries, where 3 months notice is standard. Other parts of Europe are not like this, and in Ireland you can fire as per the US for the first 6 months/year, and only need to pay redundancy if they've been there 2+ years.