Don't you think it is more centralization introduced into the decentralized world? In fact I categorize google appstore as a centralization that should not have existed if we are going to talk about decentralization. And I would even go as far as saying when people were downloading wallets from the centralized google store, it was a loss of decentralization and when they shut down it can be categorized as a win.

What we need to reach better security are these 3:
1. 100% open source software
2. Reproducible/deterministic builds
3. Signed binaries

This trio would ensure that people can download compiled software from literally anywhere not just some "trusted" centralized server controlled by one entity (single point of failure). They just need to verify the hash for integrity (a hash that anybody who compiles the same source code can vouch for) and verify the signature for authenticity.