Bitcoin is unique by having many following things: PoW, no premine, decentralized network, no censorship, and decentralized developments so no issue if one Bitcoin developer left like how Satoshi Nakamoto left the community and no longer developed Bitcoin Core years ago.
satoshi NEVER worked on bitcoin core. .. core is a brand that came about by colluding devs in 2014 creating the brand in 2014, long after satoshis disappearance
also one dev of core can leave without causing big effect, but if all the colluding devs messed up or left. then there ould be issues. and yes core are centralised once you look at the devs funding background and their colleague/partnership interactions. they do not act as independent devs, but a collective
we should not just cower down and give blind loyalty/obedience to core as gods of bitcoin. we should remain vigilant and scrutinise/peer review them to ensure their decisions do not cross the line.
too many people have just let core take control and cross the line many times of whats best for bitcoin, people whom have become defensive loyalists of core devs.. there have even been events including their sponsored actions to enforce their roadmap proceeds as planned, even when the greater bitcoin community have asked for other options