VM admin: maxmessage vs maxsecs, update please

I see some posts from 2011 that say that maxmessage was getting phased out but both are still visible in voicemail admin as of 5.211.65-11. Are there still plans to remove maxmessage? Does it have some other purpose that I’m not aware of (despite having the same description as maxsecs)?

backwards compatibility for users with older asterisk versions.