games that offer the option to self-host dedicated servers often have a central “master” server. dedicated servers advertise themselfs to the master server and clients can ask the master server for a list of servers. might be that the comment was talking about a server like that.
the master server for ut 2k4 that was run by epic had to be replaced by one from the community for two years now for example.
e:
all ut games have community run master servers thread at ut99.org
deck is mostly more input options (right stick, d-pad, 4 back buttons instead of 2).
the biggest difference is the placement of the touchpads imho, as i cant use both shoulder buttons and the touchpad on a side without adjusting my grip, but that only mattered in shooters for which i use flickstick on the deck and not the right touchpad.
only thing i’d suggest is something like better leveled lists, because i hate that aspect of Oblivion with a burning passion. No glass and deadric armor for bandits.
Moo is a more complete gameplay overhaul, thats pretty popular.
textures is up to you, there are good upscales of the vanilla textures and there are well made replacements, so pick a comprehensive pack with a style you like.
very different games, hammerwatch is more like gauntlet with no meta progression and HoH is more of an action rpg (think diablo) with meta progression between runs like other roguelites have it.