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I really doubt it in all seriousness. They’re cheap both in design and material. I.e. that plastic “lever” on the side to push the knuckle closed.
Kadees are metal, with a copper spring on the side. The spring won’t get lazy over time. The knuckle and shank aren’t going to break either… which is another problem plastic couplers have.
 

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It depends on if you want to put the work into a lower end car. If the answer is yes then by all means do the swap on them. I personally don’t do it but the cars that have them don’t get my interest with level of detail. I have a ton of athearn blue box cars and I’m even going to thin the herd with them. I’ve taken a liking to Proto 2000 and walthers kits. I also like bowser 2 bay hopper kits. I’m also not one to buy a car that’s rtr because the model building is what I enjoy the most so adding all the grabs and stirrups and brakes and what not to a freight car just gets my interest. I do have a few mdc passenger cars that are still talgo but they seem to work better than the lower end freight cars
Is there a line forming for that blue box culling of the herd?

I agree with J; it entirely depends on the person. While I do like separately applied details, I’m perfectly fine with blue box… or even Tyco which require said modifications as body mounted couplers.
That isn’t really difficult. I nip the truck coupler box, then spin it so any nubs are facing car center. The 2 pair Kadee coupler packs include boxes, which I always save. Sometimes a bit of shim is needed to get the coupler box at the correct height, or a larger surface to mount to. I can’t say what thickness to use off hand. I figured it out by trial & error and then put all the required stuff in a zip lock bag labeled “coupler conversions.”
Normally, like J, I won’t bother with it… but with Tyco tank cars decorated for Arco I must. I never had success printing decals… or rather, setting them successfully with micro sol. Plus Tyco takes me back to wee years, which is also acceptable. So I’m willing to do the conversion and add proper weight to those specific cars only. They do not dominate my collection though. I only have 3, and need about 27 more.
So it really depends if it’s worth it or not.
 
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