The reason why I said not to stop squatting is because I believe all muscle groups should always be getting bigger and stronger. When the hip muscles are weak, it shouldn't take that long to build it up by isolating it - maybe 3-6 months for a full transition. And with the isolation work, the goal is still to get those muscles bigger and stronger so eventually going heavy is necessary to force those muscles to work hard.
I could suggest someone to drop their training max low enough so they can get their hips involved but people are less likely to do that if it means dropping their training max by 20% or more. So I came to the conclusion that instead of suggesting to someone to build technique with a weak muscle group, forcing other muscles to drop down in training load to allow those weak muscles to work, and interrupting someone's training plan; it's probably better to just stick with the status quo and add on the isolation work to make the hips strong enough that it can eventually work with the stronger muscle groups in time. Technique relies on the ability to recruit muscles and muscles that are weak relative to other groups can be very hard to recruit - this introduces a possibility that the person might not engage the muscle in the main work even with a reduction in training max. That's often why you'll see people unable to engage their hips by "screwing/spreading the floor" when someone suggests this to them in a form check - I have been guilty of this. Isolation work removes distractions.
It's extremely important to make sure all four muscle groups are working together: the erectors, abs, hip flexors and glutes. These muscles all work together to keep the hips stable while force is transferred from the upper body to lower body. It doesn't really matter how the goblet squat looks because it can look good even when you aren't engaging and training the intended muscles. However, it does matter how it feels because that's how you know you're engaging the muscles and it'll likely look good if it feels good.
It took me 9 months to solve my imbalance and inability to brace my abs. My left shoulder would drop and my left knee would push out all because imbalances that started from high school sports where I did wrestling and pole vaulting and mainly jumped off my left leg. I spent a couple months focusing on ab bracing with beltless low bar squat, a couple months focusing on engaging glutes and abs with front squats, and a couple months focusing on hip flexor engagement with beltless high bar squat. Each time I didn't have much carryover to my main lift until I realized that I focused too much on one aspect. I finally brought it all together in the past few months and now feel more even loading and soreness throughout my back, abs, quads, glutes, etc. Everything feels good now and I'm back to hitting PRs after a long plateau. That's the reason why I keep stressing to load all four muscle groups in order to train them together. Working on only one area instead of the entire system didn't work well for me.
It's up to you if you want to build the technique with your main work. I would suggest doing cycles to spend time with different variations such as front squat, high bar and low bar squats when building technique because the hip mechanics should feel the same for all the lifts even if the torso angle changes. The abs should be braced just as hard for all of them. The loading might be slightly different but the way the hip works is the same.
With isolation work you want to train with medium to heavy weights and vary the rep ranges because the goal is to make those muscles grow in size and strength. They are important muscles for moving big weights. IMO, the hip stabilizers shouldn't be the limiting factor when squatting.
Aside from the hips, shoulder stabilization and lat engagement may also come into play and it's hard to say whether that's contributing to the issue for you. A weakness in one point in the kinetic chain can possibly cause problems down the chain as muscles get overloaded.