We don't support update with ftp since joomla 1.x or 2.x? don't know but it's not a supported upgrade path at least since joomla 3.

I'm closing this but thanks for looking.

Well, at least I warned :)

We already had such issue when auto update failed, and backend was locked, due to unfinished DB update.
User will not be able to recovery esialy.

It not a question if we support or not. I wrote about FTP as quick example.

That's a problem we can't fix with our current way of upgrading. Needs some rewrite of the update to detect failures. Maybe with checkpoints or something. But in such cases use the backup or apply the schema update manually should be enough. Ymmv

This is a module, and I think about wrap ModuleRenderer->render() it in to try/catch.
I had this idea for long time. In some cases It is also cause a broken rendering on the site: half normal page with another half is error page.

In oposite to plugins that hard to try/catch, the module's try/catch should be okay. What do you think?