1)
Lots of themes to choose from, you don't have to stick to the default one
2) No panel shadow is a design decision, not a sign of something being in development
3) You can add it yourself like this:
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sudo gedit /usr/share/cinnamon/theme/cinnamon.css
Find this section:
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#panel {
color: #ffffff;
background-color: #555555;
font-size: 8.5pt;
font-weight: normal;
height: 25px;
}
Add this line to it:
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box-shadow: 0px 0px 2px 4px rgba(0,0,0,0.6);
The line adds a shadow effect around the panel with 2px blur and 4px spread where the black shadow color has 0.6 transparency (1.0 = opaque, 0.0 = transparent)

Thank you for this thread. That’s all I can say. You most definitely have made this forum into something special. You clearly know what you are doing, you’ve covered so many bases. Thanks!