I'm glad you brought up the BKN-HOU trade, because it's a good example.
The Rockets traded a 2025 FRP and a 2026 Swap for: a 2025 Swap, a 2027 FRP, a 2029 FRP and a 2029 swap.
So, they turned one pick and one swap into two picks and two swaps.
The Spurs, on the other hand, traded one FRP for one pick and one swap.
And, there is far less of a timing differential.
In other words, the Rockets got SIGNIFICANTLY more value than the Spurs did. Part of the reason they got more value is because BKN desperately need control over their next two drafts back... but, it illustrates how little value the Spurs got in this deal.