I've played in games that don't allow multiclassing, but never games that don't allow feats. Go figure.
Excellent questions, but the answers are simple.
You argue that feats/MCing are equally as 'optional' as things like the optional rules for facing or rest length. I argue that unlike the optional rules in the DMG, feats/MCing are really part of the core game, only made 'optional' to make the game easier for new players, in the full expectation that they can start to use them if they want, on an individual and PC to PC basis, as soon as they get the hang of the game; that each game expects to use them.
But it's not what you think or I think that counts. What does WotC think?
Two bits of evidence supporting my 'core game' stance: first, they are in the PHB as options players can make for their PCs, just like any other option, like class, race, background, spells, weapons, subclasses, etc.
Second, Adventurers' League. The rules assumption of AL is the way WotC expects the basic game to be played, and doesn't use ANY of the 'optional' rules; y'know, the one's in the DMG. It treats feats/MCing as part of the basic game.
This is why I don't like a whole class of feats, the sort that gives a "new way" to use an existing mechanic.If playing in a group that uses the Feats option, then a series of things a PC might try is disallowed during the game because those things are covered by feat rules.
Paint the picture however you like, with whatever sketchy data you like, but the people that drive the D&D market are the people that explore all their options. I've played with about 8 different distinct groups of players in 5E era (excluding single session delve groups) and:
1.) They all made use of the feat rules.
2.) Humans were only slightly more common than other races - and every single human character was a variant human.
Paint the picture however you like, with whatever sketchy data you like, but the people that drive the D&D market are the people that explore all their options. I've played with about 8 different distinct groups of players in 5E era (excluding single session delve groups) and:
1.) They all made use of the feat rules.
2.) Humans were only slightly more common than other races - and every single human character was a variant human.
I'd love to look at D&D Beyond data that shows:
1.) Only characters that have been in the system for 4 months, and
2.) Have been updated in level twice since being put into the system.
That would give us an interesting view of characters that are likely in play...
Every single Noble. They all have that feat that lets you choose one of the Battlemaster's maneuvers.How many published adventures have NPCs which use feats? I think the answer is zero. It's assumed to not be part of the game.
Why is it a group decision about whether or not my PC can choose a feat? Does the group decide what spells I'm allowed to choose? What weapons? What background?
What business is it of 'the group' to decide things about my PC?
This is why I don't like a whole class of feats, the sort that gives a "new way" to use an existing mechanic.
I want more feats like Martial Adept and Magic Initiative. Feats that give your character access to a new mechanic are great.