How do you think it should be treated? I think at the individual granular data point level adding a tag or note about the equity not being immediately liquid is a good start. But I don't think it'd be a good idea to weigh the stock differently since that can depend on so many things. For example SpaceX and some other private companies do offer regular liquidity and I would consider their equity close to liquid.
Appreciate the feedback though, and definitely agree we can work on how we display the data and make it more clear.