Construction costs are currently skyrocketing

... wage reviews with downward adjustments of pay grades ...

Is that allowed? Hopefully there are contrary court rulings on this.

Are collective bargaining negotiations a one-way street? To benefit when things go well and not participate when things go badly? A somewhat questionable attitude. Wages and salaries should be adjusted to the situation. We had flat-rate wage increases.

Wages and salaries should be adjusted to the situation.

I completely agree. One can debate the assessment of the situation.
Part of the situation is that the employee does not bear entrepreneurial risk, but through the quality of their work shares responsibility for success and thus also for their own salary and that of their colleagues.

We had flat-rate wage increases.

We have solved this individually, paying special attention to the criteria "equality of pay between different genders" and "performance".

As so often, there is probably no justice here either; some industries come off better, others end up empty-handed. Currently, the market is indeed very difficult to interpret since no one knows how sustainable the inflation development will be.

Personally, I do believe that we will have to deal with a sustained 3-5% inflation and I expect massive wage increases especially in large corporations. All unions calculate according to a similar principle: inflation compensation + productivity increase + revenue situation = negotiation situation.

Since companies, despite Corona, are mostly reporting record years (all major IT companies, car manufacturers, chemical industry and even some banks, etc.), the wage rounds next year and the year after will definitely be exciting!

Regardless, tax cuts across the board would of course be urgently necessary and much more important. Germany takes too much from the gross income, which leads to significant income losses especially for middle incomes and families.

other people get nothing

I am currently left empty-handed, currently have 2/3 of the annual turnover outstanding.

: Do you really still want casement windows?