I totally agree with you.
I often fly out of LGW with both Easyjet and BA. It was THE main factor for me to aim for the Gold card. Now that this perk is removed, it makes NO sense whatsoever for me to have Gold.
As you said, there’s not much difference between Gold and Silver, I care little about the First lounge in LHR when the Club lounge is good enough for me. So Silver happily I’ll go, and less business for BA!