If you are a studio still using Maya 2018.5 today (and yes, many mid-sized game studios are), you aren't behind the times. You are riding the peak of stability before the modern telemetry-laden, cloud-dependent versions took over.
Autodesk had a habit of releasing massive, buggy feature updates in July, then spending six months patching them. By May 2018, the community was frustrated. The "Maya is dead" hot takes were at an all-time high. Autodesk Maya 2018.5
Why? Because it was the last version that ran reliably on older hardware (pre-AVX2 processors) and the last version that didn't require an enterprise subscription for basic scripting tools. Consequently, it became the pirated version of choice for students in developing nations for nearly three years (2019–2022). If you are a studio still using Maya 2018