No it isn't - a senior engineer should be a technical track professional that's excellent at their job - it's likely there will be a fair amount of mentorship but that can take many forms including PR reviews and pair programming.

A technical lead, architect, or a front line manager is the one that should be eating meetings four to six hours a day. And absolutely nobody should be in eight hours of meetings a day - even bullshit C level folks should be doing work outside of meetings. Eight hours of meetings means that you're just regurgitating the output of other meetings.

I'd clarify that having occasional eight hour meeting days isn't bad, there might be occasional collaboration jam sessions that everyone prepares for... but if your 8-5-52 is solid meetings then nothing productive is happening.