The flow of conversation might not always make sense. Maybe an x'd out comment from that person.
If there is a need for such a feature I think it would make more sense to work on solving the underlying problem. Since members have different preferences reasons for using this forum, expecting everyone to be happy with everything posted here is probably to expect too much but if some members' contribution to the discussions are better appreciated as "x'd out" that is a problem that could and should be taken care of.
We try to moderate this forum in a very sparse and objective way in order to let it live it's own life and it's therefore very important with feedback from active members. The very best way to do this is to regularly
use the "Report to moderator" feature when you come accross something you find disturbing, not contributing or something that makes the discussion degenerate.
We do carefully consider all reports so please make use of this feature!
It's an easy and unpretentious, yet important way to contribute to a better Piano Forum.