Auto-snap row height to baseline grid
Tables need an automated interaction of table row height with baseline grid (i.e. where row heights snap to baseline grid depending on cell contents, for instance). If this was a thing, it would solve all vertical space problems related to tables, because it would be enough to create a paragraph style with a leading matching that of the baseline grid to use and style the cells text with. Then you'd have real, modular, accurate yet automated control of tables' vertical deployment in the page space (not addressing overset cells, though).
Yes! It would also need to allow for a cell that has multiple lines, so that the row height does not equal a single line of text, but allows multiple lines, all of them sitting on the baseline grid. So for example, a row with 2 lines' worth of text is 2 baseline grid lines wide, and both lines of text can sit on the baseline, while a row with 1 line's worth of text is 1 baseline grid wide.