It would be nice if depth snapping would work in 20 or 25 cm segments (not exclusively to other pool depths). Then we could create longer slopes over multiple pool tiles. And there should be a new kind of depth tile which is a connection between path and pool without a barrier. This would be perfect to create easy walk in pool lagoons (like many wave pools are built that way)...
Stairs (not ladders) are really missing for mid-dephts pools (can't place short ladders here! Why?).
Translations (German) for pool depths are strange. At least the deepest one is translated "absinkend" (sinking?) instead of "tief" (deep). It's irritating... I thought it's meant the slope between different depths.
Better solutions could be (from shallow to deep): "Flaches Wasser", "Nichtschwimmer", "Schwimmer", "Sprungbecken"