Abrams excels at character vinettes, but tends to fail at the greater story arc a movie or TV series needs. He is horrible with endings, which may be why instead of a real ending, we get a “to be continued” setup for the next film. TFA is rubbish in so many ways.
So you must feel the same way about the prequels then because every single one of their endings whad a “to be continued” set up for the next episode. TPM with the whole sith/ palpatine " was it the master or the apprentice" thing. AOTC with the beginning of the clone wars and seeing the ships taking off and then ROTS basically setting up for the continuation into episode 4.