Look, if here were free of course I'd want Beckham. Once you factor in the normal $3-5 million spending margin teams normally keep, plus the practice squad, the Rams will likely need to cut somebody to make room for him.* Add in the loss of the picks, and I don't think it makes sense. People complain about Watkins costing a second for a year's play - but at least he helped Goff develop, and helped the team make the playoffs. The team is likely to make the playoffs without him, and are arguably the favorite to win the Super Bowl.
I want a good young player, probably an edge rusher, with that first. I don't want a hole created to get Beckham, and I would like the Rams to have a little space to fill holes with late cuts. I also don't want a head case who may end up being suspended, if that viral drug video is any evidence.
*Yes, without having to pay a first, and with having a smaller than usual safety margin, and basically only adding rookies or very inexpensive veterans to fill holes the Rams probably could fit Beckham in - but that includes not being in position to offer desirable UDFAs decent signing bonuses and things like that. So if anything goes wrong, the Rams would likely have major holes. I don't think that is desirable. I would rather the Rams find a deep threat in the draft if they don't have one on the roster, while using the first round pick to either fill a major hole or to take BPA