I think the points made above about his not being an automatic starter under a new coach are valid.
I’d say his technique in some areas is very good, and, in others, limited. A player like that should be played to his strengths. The physical decline I think is real. Full backs who bomb up and down the flank usually age sooner than CBs.
What others are not considering—out of their understandable loyalty to our best LB in the 23 years I’ve been watching—is that, despite our back line consisting of basically the same players since 2018, our defence is not the imperious thing it once was. You can mention the midfield offering less protection etc., but we also see more defence screwups. Why is this? I imagine it is at least partly because some of them are ageing together (VVD, Matip, Robertson). That little one yard gap that opens up because a player hasn’t got the same stamina as before can be enough to take you from the number one best defence in the world to just one of the best defences in the domestic league.
Right now, Robertson is okay, but looking a year or two ahead, it would be smart to bring in a top class understudy/upgrade to share his gameload and rival him, ready to take over in the near future. It would probably help prolong Robertson’s highest level career and give him competition.
Nothing wrong with saying that: amongst the oldies, only Salah, Van dijk and Alisson are so good that you shouldnt be looking to phase them out in the medium term, but rather hold onto them for as long as they want to be here unless something crazy happens.
Standards at Liverpool are super-high now.