moskimus

This gets thrown around a lot, but it's not entirely true. Depending on the particular distro, only certain core packages are likely to get updates on LTS releases. Non-core packages may just get left to rot until the next LTS release. Specifically Ubuntu follows this. A lot of their non-core packages just get imported from Debian and then just sit unmaintained until next release (this goes doubly if not using Ubuntu Pro).

You may be right. I checked before replying, but I may have just been tricked by an optical illusion with the extra padding shifting everything.

By default there are only 2 densities, but there used to also be a "Compact" option which was removed. I believe it is possible to still enable this, though it is officially unsupported at this point.

It still exists. Customize Toolbar -> Density (bottom left). There are only 2 or 3 presets, but it is possible to slightly adjust the icon size. Just confirmed on 109.0.1.