Kind of a weird take but I'll answer your questions.

1. A longer average may be used if 30 days don't seem to be enough time. We're taking average values because that makes it harder to manipulate the price by making big buy/sell actions.
2. Getting rid of the softpeg would mean price don't need to be constrained. This will allow the price to go higher thus increasing the value of the season reward pool.
3. 30 second snapshots should be plenty frequent in my opinion but similar to [1] it may be changed if needed.
4. Holding CROP tokens is not the only way to get a bigger end of season reward chest. Moreover, this change actually makes it cheaper to buy reward chests from the shop (at the the time of writing when CROP token is at $0.0018.
5. This update aims to provide more utility to CROP tokens by utilizing its market value rather than a static value which may or may not justify the price. For example, BETA packs are currently priced at a flat rate of 3000 CROP tokens but when using HIVE or HBD it is priced at 3USD. So the current pricing in CROP tokens is unfair since 3000 CROP is equal to ~5.4 USD.
6. There's no secret sauce. Every 30 seconds a snapshot happens and all such snapshots in the last 30 days are added up and an average is calculated. As to why has been already explained above.