I think what might be counterintuitive about this is how different a terminal collision in a Rebuild deck is than in an engine deck, and since these days we spend 90% of the time playing engines that's the kind of 5$ + 5$ collision you're gonna be thinking about. Colliding 2 5$ terminals is really bad in any deck. But like. In a Village-Journeyman deck or what have you, if you collide your Journeyman, you have something that should have been a 5$ turn and messes up and becomes a 3$ turn. So you buy Village when you would have rather bought Journeyman. It's bad. But it's a deck where you are trying to get pair Villages and Journeymans with eachother, that's the game, and a Village is still helpful. Say you have 4 Villages and 2 Journeyman at this point. It'd definitely be better to get a Journeyman. But having 5 villages instead of 4 still increases the chance you draw a village and a journeyman together, even if it doesn't do so quite as effectively as an additional Journeyman would.
Like in actuality you often have this happen with 4 journeyman 1 village because you've seen this movie before and you know how this works. You collide your journeymans, can only buy a village, and it's kind of a blessing in disguise.
The consequence of colliding terminals in a terminal rebuild deck is totally different. Do not pass go do not collect 200$. The effect is 100% of the time "take 3 VP chips and throw them into the motherRatsing Garbage". It's always -3 VP, every time. It is always, Witch yourself 3 times, minues the actual clogging amount. But still. This is brutal. This is so much more brutal than "I'd rather play a rigged poker deck with 6 Queens and 4 Jacks instead of a rigged poker deck with 5 Queens and 5 Jacks", which is what the engine scenario was like. This is like your wife passes buy the table and picks up half your chips and heads to the cocktail bar to buy drinks with them. So it makes lots of sense that it would fall off very rapidly.