They probably wanted to see what people prefer - new characters or nostalgia. A lot of people here wrote they don't want TNG 2.0 and don't even wanna see any old characters, others wrote they wanna see Q, Bev, Worf, etc.
Nepenthe seems to have been very well received, and Data's and Riker's scenes in the other episodes seem to have been universally loved. I also got the feeling that not all new characters were found interesting or relevant (Narek, Narissa, Oh). So I guess they're more confident now to bring more TNG elements back. If the next season also has 10 episodes, and one deals with Guinan, another with the EMH, they can still add TNG people to 3 more episodes and it's still only half the season.
Edit: New video discussing Nepenthe!
Nepenthe seems to have been very well received, and Data's and Riker's scenes in the other episodes seem to have been universally loved. I also got the feeling that not all new characters were found interesting or relevant (Narek, Narissa, Oh). So I guess they're more confident now to bring more TNG elements back. If the next season also has 10 episodes, and one deals with Guinan, another with the EMH, they can still add TNG people to 3 more episodes and it's still only half the season.
Edit: New video discussing Nepenthe!
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