Says the person who resorted to pointing out a rule was optional.
RAW is usually used in the context that regardless of one's opinions that's what the rules are. DM can change it but if so they need to communicate that to players imho.
Variant humans are optional. All races except the common races in the PHB are optional.
Yet I see all kinds of threads on this discussing RAW as it pertains to them.
No DM I know of has a list covering every optional rule in the game. You're probably safe assuming multiclassing and feats are being used but even that's not absolute. DM should probably indicate they're not being used.
Sure. But I can say
"Play a Variant human and take the GWM feat to boost damage (2 optional rules in one statement)
" or I can say "
Play a Mountain Dwarf and put your +2 bonuses in Charisma and Dexterity" and I don't get someone jumping down my throat about it being "optional".
As a point of fact fighters can change subclass. If that is not allowed at your table, fine. Just like I guess you don't allow Variant Humans or floating racial bonuses. That is your table (and others I am sute) it is not allowed at though. It is still an option available to Fighters (and all classes) in the 5E game.
My initial statement was a reply to a post that said
"Fighters make 1 single subclass choice"
I corrected that post and stated Fighters can change subclass, pointing out when and the book and page number that afforded that option. What I said is a 100% RAW, factually true statement. It may not be allowed at your table, but it is allowed at some, and it is RAW.
You can't count on optional rules being used and ask the DM and subject to DM approval are much the same thing.
Unless DM has said otherwise you can't count on fighters being allowed to change subclasses.
You can't count on them not being used either. Whether it is used at a specific table or not though, it is available in the official WOTC 5E game, hence Fighters can change subclass.
No DM I know of has a list covering every optional rule in the game. You're probably safe assuming multiclassing and feats are being used but even that's not absolute. DM should probably indicate they're not being used.
Wait a minute. When it comes to RAW Feats and multiclassing is no different than changing subclass.
Your original post on this thread mentioned a ton of optional content, including Echo Knights, Rune Knights, Purple Dragons, Feats and Bladesinger. None of that was caveated as optional and it was presented with the idea that it was part of the 5E game.
Otherwise they're purely hypothetical.
This entire thread is hypothetical with the few exceptions of actual anecdotes and examples from play I posted.
Disclaimer: Others may have posted some examples from play too, if so I just missed them