I tend to agree and I also have a Bitcoin address on my profile for the purpose of proof of ownership, we don't know what will happen next when our valuable account in the forum will get hacked. So, in able to recover, you can simply sign a message on that address as proof of ownership besides on the staking address thread mentioned above.
Address on your profile can easily be changed by your or hackers. It does not make any sense to prove your ownership if your account is hacked. The signed message and the post was quoted by someone else with your staked address help you.
Your signed message won't make much sense if it was not quoted by any others. You or hackers can delete or edit that post. Data scrapers can have their unofficial data but it belongs another thing. The forum has its trash can that can help too. However, for public eyes, a signed message that is quoted makes more sense.
If you're concerned is privacy while holding a big fund, you can create your cold storage wallet for the purpose of saving a huge fund separate to the address that you've used in the forum, to avoid not being linked from the Bitcoin address that you've used in forum, you may able to use mixer service to increase your anonymity.
It is a leak and take care of yourself if you do so. Leak when be seen or archived, can not be deleted. So make sure that the address you add to your signature or profile won't harm you at any levels.