But then again, the same way there are plenty of games with expansions which don’t fall in the definitions you gave…and can be interpreted as not true expansion. You see double-edged blade…
I hate mentioning names of other games in a specific game forum but for the sake of argumentation–and yes yes comparisons are unfair, pretty aware of that–but
ESO ( Elder Scrolls Online) being playing it for the past 4 years. They do release every year expansions of their map (which is pretty big, even with separate maps which one can access via fast travel) new dungeons, new weapons, new skills etc and you are given the option to:
A) as a veteran to explore the new area/map at your will with your current character progress
B) start a brand new character if you wanted to
That game also adjusts the content difficult (for the sake of simplification) to the players level. So the player at level 10 experiece the content adjusted within a range that includes the player level and so does the max level.
Now quoting another game, yes different style etc but for the argument, The Witcher 3. You get your expansion and one can only access those areas when a specific level is reached.
I understand the tech-limitations… but the term expansion is sort of misleading, if feels more like Conan Exiles II rather than Conan Exiles expansion.