[Hosting] Why an outdated database for hosting ?

looking at the "system info" in the wpmudev dashboard plugin,

it shows the following ;

Server Version 5.5.5-10.1.37-MariaDB-1~bionic

it seems to me this is MariaDB 10.1 based off MySQL 5.5 ?

is this indeed what is used ?

if so, why such an outdated database ?

i am no server admin/expert but its common knowledge that mysql 5.7 is much faster than anything before it.

and even 8.0.13 is also out.

MariaDB has their 10.2 and 10.3 versions as well.

again am i correct in identifying this correctly ?

it is often stated how important database performance affects WP sites so why not hit the ground running with a new up to date DB ?

suggestion ;

if wpmudev is using DO servers/infrastructure,

why not use the exact version DB as their upcoming managed DB ?

https://try.digitalocean.com/dbaas-beta/

so that anytime in the future if wpmudev decides to offer more powerful plans, a managed DB could be a great option and easier to transfer with same type of DB ?