Watchlists are ideally snugly categorized lists of company stocks. 

Tight categorization (by sector, ideally sub-sector) is important because P/E ratios (price to earnings) are specific to sectors.

So a trailing P/E ratio of say 40 might be average for semiconductor hardware stocks, but too high for say Energy stocks. 

So if you put these 2 types of stocks into the same watchlist, then the P/E related metrics will make little sense, like vs Avg P/E and vs Avg Fwd P/E. 

Its always better to put stocks into tightly categorized watchlists, like: AI hardware ( Micron, SK Hynix, Seagate, Western Digital, etc ... ) or AI infrastructure ( Broadcom, Ciena, Marvell, etc ... )