I'm afraid I can't really agree - BotW is quite restrictive game that has few mechanisms that indeed make some of its gameplay free-form to a degree, yet that's where all the freedom ends...on mostly non-important stuff, at least from my POV.
For example, try getting into Gerrudo town on any other way than only one predetermined by game. Nope.
Meanwhile in Morrowind...want to make some custom spell that inflicts damage to strength on half a town? Sure, craft it if you know how to. You don't even have to do the main quest and still finish the game...or make NPCs do it for you.
From my POV (which is admittedly RPG one): BotW has (limited) freedom in some, overall, less important things, that result in lot of flash, but are ultimately just a fluff. Morrowind has meaningful freedoms, because it was made still in days when Bethesda was making RPGs based on P&P principles (which are the ultimate freedom in gaming).
That's untrue mate as the many videos online show BOTW has many mechanisms that use it's freedom if you want examples look up players like CHC Yu who are finding tricks by the day and implementing them in play this isn't a case of POV it's a case of what the game actually does. Your Gerudo example is also flawed because you compare an optional situational in BOTW to a combat situation in Morrowind, Gerudo town is whether someone wants to play through the story elements or not and even then the player only needs one item set to enter it and then you're still free to do as you like Morrowind in in a similar comparison doesn't do anything that offers more freedom because as someone highlighted it utilizes the linear style progression.
Want combat examples in BOTW I'll highlight 3 of CHC's tricks that highlight the creativity of playing around with BOTW:
- Using the bomb and stasis you lock an enemy in place and detonate the bomb under them to store upward momentum on them this will launch them in midair as you release them from stasis, as they're released you shield hop on them which will give you height off the ground to enter slow motion to bombard them with arrows.
- Using Daruk's Protection during a shield hop gives you a hop action that allows slow motion activation when you want, using this you can use Ice Arrows to freeze two enemies with in a group of enemies then switch to Lightning Arrows and keep hitting one of the frozen enemies because ice is a water based element electric attacks disperse as a result and become aoe using the game's physics to your advantage.
- Another is an AOE parrying trick Link can parry his own explosive attacks so using either bomb arrows or normal bombs you can trigger a parry that interrupt enemy attacks dead in their tracks regardless of where they're attacking from, the same trick can be used to activate Link's quick rush instead allowing players to counter through attacks with out having to wait for the window of timing for a dodge.
This is how sandbox mechanics are approached as even if you chose not to use them as you've said in the other thread the level is freedom is there believe me Morrowind doesn't have the level of freedom in BOTW because in the latter not only are the mechanics utilized but anything in the situation from physics, objects, enemy behaviour/AI, weather, environment properties etc... Like I said Morrowind is a step above other games that take its route but your claim on BOTW being constrictive is simply not true the are tonnes of videos that already disprove.