Why compiz reloaded instead of compiz repository?

[Philippe]

Hello,
Considering the bellow tuto to install compiz reloaded for 19.10 or 20.04, please, can explain to me why we should not install compiz from Ubuntu's repository with:
sudo apt install compiz compizconfig-settings-manager
With Ubuntu Mate 20.04, install compiz from Ubuntu's repository works fine. So, I need more explanation.

Installing Compiz Reloaded

Things to know before installing Works for 19.10! May cause isssues on 20.04. : Information for Focal Fossa prerequisites needs editing to be compatible. This is explained further down this guide. There are issues with this, beware as this may not work on all machines. Information for Eoan Ermine Using the latest Ubuntu as of this edit? Excellent. Skip right to installation:arrow_up: since Compiz isn't a thing that ships with Ubuntu MATE…

[Norbert_X]

It is workaround to fix bugs in normally packaged Compiz.

See other thread for details

Compiz issues in 20.04

Anyone got Compiz to work? Because I failed, like I did in UM 14.04! I installed SPM and then Compiz, including all the items cited here by @Wimpy in his 19.10 release info If you love Compiz, it can be installed by opening a terminal and running the following command: sudo apt install compiz compiz-core compiz-mate compiz-plugins compiz-plugins-default Only having one window manager to target means we can promptly deliver new features and minimise development effort. plus I…

I still hope that compiz-mate package will become fixed before final 20.04 LTS.

[Philippe]

I disagree. What bugs? I can install compiz in 20.04 from repository and no bug observed. That's why I ask. Can you explain more?

[Norbert_X]

@Philippe

What bugs?

So you are saying that you see desktop decorations on MATE session?
Please provide screenshot proofing this.
Last time I have had the following:

(there are no window decorations when Compiz is active window manager)

[Philippe]

OMG, I'm so sorry, I didn't see that issue when I tested in my virtualmachine 20.04! I had imported my compiz settings from my laptop 18.04 and when I see the sweet windows effects of compiz in 20.04 I ask my question here. My mistake I test to fast.

[mcdonc]

FWIW, I installed compizconfig settings manager and then selected compiz in 20.04 today and everything seemed to work (including window decorations).

[Philippe]

@mcdonc: Can you show us your evidence? With screenshot of compizversion+ window decoration