I am trying to set the vertical height of a row which uses diagbox to be smaller, but past techniques such as \setarstrut and cellspace appear to not be working thus far. In particular, I am able to almost create the table exactly as sought, but the the row with the diagonal is too tall. How exactly can one set this particular row to be a constant height (e.g. to match the height of the other rows)?
The environement NiceTabular of nicematrix has a built-in command \diagbox which gives directly the expected output. Moreover, you have a key hvlines which draws all the rules excepted in the blocks.
However, nicematrix package have the issue of being unable to adjust it's own version of diagbox command such that one can't bold the text using \textbf in the diagbox and also can't do \raisebox command to position the text in the diagbox nicely.
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