Great suggestions Dave. I would gladly support the first 3 as a healthy compromise. The 4th I can understand, but I agree with @fighter4-freedom - an arbitrary benefit only for cards above max level will have the appearance of appealing mainly to the top established players at the expense of the newer (or "still building my deck") playerbase.
If the max level issue is to address a concern is that too many bot accounts will print and dilute, perhaps the future TBD burning benefit should be for another soulbound, but spendable perk (like guild power, Power cores, DEC-B, or any asset that helps players advance but doesn't impede "ability to play competitively").
e.g. If bot accounts have thousands of soulbound cards and they want to burn them for power cores, they will still be soulbound and would still need to unlock cards to work them.
This way any burned card bonuses are merely substituting one soulbound asset for another and there is still burn/play value to those accounts actually collecting or building their account, at all leagues and levels.
Thank you Oaaguy! I appreciate your time reading and for the suggestion and feedback. Finding compromise isn't easy, but hopefully we can find one and move forward.