I think it works with the lines for certain tables, but for others it works better without, like my table near the top worked better with the lines, but another where I am using a table to align a video that wouldn't align in the centre otherwise, it's best not showing the lines.
And I definitely agree with you wanting them back for your own, as it would work better with the lines, but the background colour variations are really nice as well (really like that new addition, which I don't remember us having before?)
Btw really great profile, so nicely laid out and designed :)