I don't think the title has lost its meaning entirely, but it is entirely relative to the company size. A "Senior" at a 10-person startup is often just the person who has been there the longest and knows where the bodies are buried. Put that same person at a FAANG company, and they might map to a mid-level IC4. Instead of looking at the title on the business card, I look at their systemic impact. Are they fixing bugs, or are they fixing the engineering culture that allowed those bugs to happen?