They're SUPPOSED to be used in such a way as to supplement while you gain more capacity. In my mind, that's how they're supposed to work. I myself make use of the Edgerunner perk with my build. But I'm always at my limit because I was constantly adding better cyberware. There is little to no point in the iconics if your limit is arbitrary. It makes no sense. The upper limit looks to be in the 400-area, with the Edgerunner perk granting you an excess of an additional 50. That is the way the UI looks to be designed. Even with the Chrome Compressor, you can't hit anywhere NEAR that limit. It makes zero sense to include a UI element that has an upper max limit, and give us no way to achieve it. That's an awful system and needs a rethink if that's "as designed". But, it would seem the devs are aware of CWC shards not dropping, and I do not believe that is the intention behind the system.
Removing "fun" by completely limiting what a player can do is the most ridiculous thing I can think of, especially in a game with as much build freedom as CP. You can literally replace your entire body with cyberware and become an unstoppable force. The purpose of arbitrarily removing our ability to do so at level 60 makes sense because... why? If that's the case, Carrying Capacity Shards should have ceased dropping AGES ago. I should not be able to carry 600 units worth of random guns. But I can! And it's not because of my cyberware. If "limits" need to be imposed, then Skills should have a maximum progression pool, no? Forcing us to "max out" maybe 3 total, which bits dribbled into the others.
See how ludicrous that sounds? Carrying Capacity Shards should have stopped dropping LONG ago when I hit like 300 carrying cap. Naturally, that's already a lot, and that was already further enhanced by the stats on 2 of my cyberware bits. People have randomly hit a "cap" on cyberware capacity just because they hit 60. We're being punished for playing the game. Some people have 250, others have 300, I SOMEHOW have 339 (with the Edgerunner perk), but if I remove any of my cyberware, that dips down to 333. It makes no sense!
So no, there's no logic to what you suggest, because at the "intended" maximum line of 400 (what it looks like just by eyeballing it), we would be able to exceed that to 450 with the ER perk, allowing us to slot some truly gamechanging CW. Who cares if it makes us more busted? BUSTED IS THE NAME OF THE GAME! I can literally waste a wave of NCPD cops just by holding a button and then launching a burst of wrist rockets on Very Hard. Is it broken? Absolutely. Is it FUN? ABSOLUTELY!
If we're gonna be arbitrary, then nerf the daylights out of my entire setup and bring the CW cap down to 200. There. Now you can't do anything fun that you want. What purpose does that serve, other than ruining the game for everyone involved? The answer is "none". Zero purpose to doing that.
So yeah, no. CWC shards not dropping after you hit 60 is an obvious BUG when you consider Carrying Capacity can continue to drop from Dogtown airdrops until you can carry in the THOUSANDS OF UNITS and beyond.