Ubuntu and flavors don't want to encourage people using unsupported or past-EOL software, thus you may not get much support from people associated with Ubuntu projects, flavors, members etc.
We of course are happy for people to continue using our software past its supported life (we silently smile often), hope you're offline, but usually move on to other posts.
I'm not a Ubuntu-MATE team member, have no authority here, but I am affiliated with other Ubuntu projects & teams. If i'm wearing a hat, I see this as my Ubuntu News hat being worn trying to publicize the 3 year supported life of Ubuntu flavors