Back when Purple Zealios V1 were introduced, MX Clears were known to be scratchy and that keycaps sat unusually tight on them — both problems which Zeal fixed.
If anything, MX Clears have only gotten worse. If the search function here worked better, you could perform a search and see that posts since 2018 have not spoken of Clears favourably.
I doubt even the official Ergo Clears will have normal-sized stems now.
Zealios were never 1-for-1 Ergo Clears anyway. They actuate or have the tactile event a little lower, I think, and it's not the exact same shape. Being Gateron, the tactile legs, leafs, and springs are simply different.
So Zealios are more of an alternative than a replacement for Ergo Clears.
The original OUTEMU Sky stems were a direct attempt to replicate Ergo Clears, and some preferred those in their day. [Then they got changed to 2.2 or whatever, which was its own thing.]
It is the Naevy switches that attempt to simply produce a factory Ergo Clear, and they are pretty close. Don't know what the new 2.0 are like, though. Custom switches tend to go their own way over time. CAP Browns kind of feel like light Ergo Clears, though.
Lakeboredom, good point about Hyperglides. Incompatibility with GMK is unforgivable, esp. for Cherry. That would be an interesting thing to find out, and restoring compatibility would make Cherry Ergo Clears more competitive in the short-run.