I am going to say cause I just remembered. Larian has been pretty consistent in saying they had no plans for DLC or a sequel, rather they are not putting any planning or resources to those right now. Whenever asked the answer is focusing on BG3. Their main focus is BG3, and they are going to focus on the main game before anything else. So ultimately I don't think the possibility of a sequel or DLC is what would limit levels.
If that's the case then it's gonna be a big problem for gamers. No gamer, except for few super tabletop nerds, will sit through a CRPG for hours maybe days without leveling up aka having character progress.
5e has many other ways of progressing, such as equipment. Getting unique magic items gives you progress, and ultimately you get through more encounters in a gaming session than a tabletop session so I reckon leveling will feel quicker as a video game. For example, one of my tabletop groups only just got to level 3 last week, while BG3 you can practically get to 3 before you even get half the companions.
I wouldn't pay that much heed to corporate words if I were you. We have no plans for DLC or a sequel would mean we have no long term economic expectations from BG3. You buy BG ip, you shake hands with WoTC, you open multiple new studios around the world, you recruit many new employees and what? You are gonna leave all that with a single game, is that so? You can be %100 sure they plan the game for future updates such as DLCs (paid and/or unpaid) and possible sequels.
Otherwise, it wouldn't make sense to leave the progression at 11-13 ( a little above the halfway). They have money, recourse and tech to complete the game up until lvl20. Why on earth would they leave it at half? The only possible logical explanation is that they will complete the progression with DLCs.
It often amuses me how some people, mostly DnD nerds, confuse a multi-million dollar product with their tabletop sessions.
Your so called progression with a +2 weapon satisfies you in your tabletop game where you encounter just a handful of fights and you play the game for few levels and you do not pay 60 dollars for it. In a video game where you encounter dozens of enemies every 100 steps, that +2 weapon can not hide the boredom caused by monotony where you know if you had few more levels you'd get more extra attacks, new spells, more utility etc. aka more options.
