Excellent choice in Youtuber 
(although he did rip into Glossika not too long ago haha!)
No I agree, I certainly don’t want to be using an SRS forever. But I don’t want to use a reader (like LingQ) forever too (on the same language). The difference is of course the process of using LingQ is way more fun and fundamental in language acquisition.
I suppose the lesson is: get as much as you can out of the SRS as you can. You don’t have to go full AJATT style and have 9k sentences; maybe instead stick with 2-3k.
Good luck and start learning Greek 