My experiences in judo and BJJ
The judo club I trained at regularly for several years was about 50/50 between newaza and tachiwaza (groundwork and throws). (Actually, it was more like 43/47/10 with the 10% being kata and standing joint locks.)
My time at other judo schools has showed the ratio to be fairly different: 75/25 in favor of throwing, or even 90/10.
My six months at an MMA-oriented BJJ club involved zero takedowns. Those were covered in judo or wrestling classes. We were allowed to start standing if there was space.
My visits to sport BJJ schools have been about 90% groundwork, 10% throws, with most of the nagewaza work being fitting in or throw-for-throw, not sparring. Maybe the advanced classes had more throws; I'm only a white belt.
I've heard of BJJ schools that are supposedly 60/40 between groundwork and throws, such as the Ribiero or Camarillo organizations, but I have not experienced that personally.
There's nothing wrong with any of these approaches. It's all down to your goals and the school's goals.
BJJ-for-MMA has little need for judo throws or working gi takedowns, but their wrestling might get a lot of attention. Sport-BJJ views takedowns as optional. Judo can be balanced or it can focus entirely on just surviving groundwork. Judo or BJJ for self-defense might give time to both, plus some work on defending against strikes.
However, I am generally cautious of an instructor who can only teach "their game". This means that it would be a negative mark if the school doesn't teach takedowns because the instructor can only win from his back, or if the school doesn't do groundwork because the instructor only knows uchimata. It's not a disqualifying error, but it's something to take into consideration.
How Things Should Be
I prefer a more balanced approach, because I want to have at least a portion of my training be relevant to self-defense. Aesthetically I dislike a judoka without a versatile ground game and the jiujitsiero whose only option from standing is to pull or jump guard. Options are good.
The best thing in grappling is to throw your opponent devastatingly, pass their guard, mount them, and choke them out from the top. But it's equally great to pull guard against a larger, stronger, better takedown artist, then reverse the position with a quick guard sweep, take their back, and choke them out. The dominant performance should be valued as much as the weaker defeating the stronger.
Because of the way sport BJJ and sport judo are taught, sometimes the best option is to train both separately. But a BJJ-for-MMA school should be conversant with takedowns, and any school that purports to have general-purpose BJJ or judo should spend at least a tenth or a quarter of their time on groundwork and throws each.