It is not really true, that Zorin Core is as light as Zorin Lite. Many users with older hardware here on the forum (myself included, as my laptop is from 2011) have found that Lite ran much better on their machines, i.e. quieter, with less overheating and faster than Core. I had Core installed first and then switched to Lite because I had overheating issues due to my Nvidia graphics card (also Optimus).
The given idea is that by Zorin OS 19, they anticipate that improvements in Gnome will be such that it will be as light as XFCE, not that it currently is.
Current benchmarking with Gnome 47 clearly demonstrates that it is not.
Due to this and other factors, Zorin OS 18 will include Lite.
This, however, is a vaporous assumption.
To say that you are sunsetting an edition because of a years out prediction strongly suggests that an unreliable prediction is not the true reason.
The actual reason is most likely related to ensuring a much stronger push for Wayland adoption.
This is in conjunction with sweeping Lite into an obscure small link instead of keeping it on the download page. "Oh... you want that old thing? Very well, it is over here in this dustbin."
This tactic further leads the end user to believe that there is something wrong with Zorin OS Lite in order to discourage its use with a rather underhanded tactic.
I adjusted the quote above to reflect the context and original statement.
The way it was snipped made it appear as though I was saying that there is something wrong with Lite and you replied with "no."
FWIW, I did replace my thermal paste, and as usual, encountered issues with opening up the box. But now, with that and properly turning off the Nvidia card, the box runs waaay cooler than before. However.....
I did install Zorin in a VM and played around with it. Meh. The panel's a bit difficult to customize. Running ps_mem.py showed its various processes taking up 1.4 GB. The closest other tested distro was AnduinOS at 1 GB. Linux "Lite" (not really) and Solus came in next at ~680 MB.
Tried to lighten up Zorin by getting rid of anything installed starting with "evolution" (didn't need the email, calendar, etc.). Turned out to be a BIG mistake -- for whatever reason, it triggered removal of Zorin underpinnings, so there now is no WM/DE at all. Sheesh! Really????
Yes, Evolution is integrated into the desktop, and is used for scheduling tasks by Gnome.
I actually agree with you; Gnome relying on Evolution as a desktop dependency is very odd. The Gnome developers explain it away, but other D.E.'s build the mechanics into the desktop instead of relying on an outside package by Mozilla to do it...
And users can run into the exact issue you describe. Removing what appears to be a non-essential application will remove the desktop environment.