I think Dave Filoni’s work on Clone Wars, Rebels and Mandalorian season 1 is generally great. Either Jon Favreau or massive fan expectations or both have been a bad influence on him.
Or it’s Disney. The Clone Wars was George’s baby. So it was experimental and free of committee filmmaking. Rebels didn’t really have that high of expectations going in as the budget was significantly lower and there was disgruntlement over The Clone Wars being cancelled. Rebels just had to look and be like the Original Trilogy. It gradually incorporated the Prequels into the plot. It rarely felt like Disney meddled but it shows a couple of times. Namely with when Ezra plays with the Dark Side. It was overall a low risk, high reward show. I’ve not seen The Mandalorian but from what I’ve gathered the second season is more heavy on fan service. I’d also consider that season two didn’t come until after The Rise of Skywalker. They had to attempt to “save” fans. Plus both Jon and Dave seem to have good will with Disney. Especially Jon as he did deliver them the goods on Iron Man and setting up the Marvel Universe. They also gave him the live action Lion King film.
Disney will do whatever they feel will make a profit. It’s why the last episode before the current one out now had Mando go through the podrace track and other Easter eggs notable to The Phantom Menace. They’re targeting the Prequel generation now.
Fan service isn’t necessarily a bad thing but it depends on how it’s used. It should always serve the story in an organic way first and foremost.