If it's a new user, folks are unlikely to go looking for them, and if it's an experienced user, they should know better.
While it's a "cheap" way to remove privileges from a user (even if there's probably an "is suspended" flag) it also reflects the fact that the user, at least for the period of the suspension no longer has the trust of the community. They're off the field, for some period, with their nose pressed against the glass.
In addition for many suspension reasons the suspension reason is shown on their profile - so the "bumping down their 1 reputation" isn't really what shames them.
Since the initial question was posted, I do believe the suspension messages was changed to
At the end of this timed suspension period, your reputation will be recalculated, and your account will resume as normal. We don't hold grudges. The point of all this is to address the behavior. If the behavior improves, you are welcome back.
But I might be here for Jeremy's bounty
This antagonizies, confuses, and publicly shames users in a way that seems "not constructive" and at-odds with the rest of our moderation philosophy. Is it worth reconsidering?
Suspensions are literally our second last ditch tool.
As per the theory of moderation
Your goal is to guide the community with gentle — but firm — intervention. Respect your fellow community members at all times; demonstrate fairness and impartiality in your actions.
This is the firmest intervention we can. That it's reasonably visible kind of avoids a situation akin to a restaurant closing for renovations when it's actually suspended for health code violations.
Suspensions are meant for a pattern of behaviour or (practically) really bad behaviour.
In short, by the time we've started throwing folks suspensions, they've been bad. The public shaming (for those who look) is kind of part of the pointy bit of our toolkit. So at this point the user's probably antagonised the community in some way - we use mod messages to try to minimise confusion, and said public shaming is... hopefully deserved.
I love to moderate with good intentions, dog jokes and occasional expressions of disappointment. Suspensions however are a tool that we sometimes need, and the current shape of it serves its purpose well.