They are constantly signing those young talents though. What they do well is sign them and develop them, they aren't expecting instant results. Verbruggen brought in for 15m+ and likely won't start regularly until next year. Ayari signed last year and barely played but he'll likely come through this year and start playing. Adingra signed then punted out on loan last year now he's being integrated into the first team.
Its not just the transfers with Brighton, it's the way they manage those players. Opposed to Wolves, we sign them expect them to contribute instantly.
Hoever is a good example of why it goes wrong here put in the team when he was nowhere near ready and then we reactively send him out on loan. Silva is similar but I at least partially get that one, the fee was ridiculous and there's an expectation someone who costs that much should contribute.