You can be forced to burn LB if you're always holding on to it, plus you lose out on having a projectile and a nice punishing tool and damage wracker. And Limit makes Cloud a bit easier to combo. There are definately some characters that punish you better while being in Limit than without it.I can understand why they do this, I mean I prefer to have LB fully charged for the whole match. Not because Im fishing for a Down B, Side B, or Nuetral B kill, but because Cloud moves So Much faster and more fluid with it active. Im able to punish in the Nuetral way more efficiently, as well as get back to the stage with a simple double jump thanks to his added side to side mobility. Granted your a little prone to edgeguard like that, but with LB full you can simply airdodge the edgeguard and snap to the ledge. Being a Samus player I know how to get charged while keeping mobile and evasive. (especially since Samus cant charge in the air) I dont use it for its recovery specifically, I use it for its mind games. Much like Samus' CS, people tend to play more defensive, easier to read, when a charge is full. However unlike Samus, Cloud can kill very handily without his LB moves. But the more time passes that you dont use a LB move the higher chance youll get your opponent to sleep on it, then bam, you punish them hard for it.
Maybe Im completely wrong and its just the Samus in me that thinks that there are benefits to holding it in.
You also lose out on Limit Cancel stuff.
That aside, Limit Cloud is easily one of Cloud's strongest trump cards and when utilized intellgently becomes something that can cause fear in your opponents and dare I even go as far as to say as allows you to counterpick mid-match since he plays somewhat differently than Reg Cloud and has to be approached, and approaches MUs differently vs Reg Cloud.
Being able to pick the Cloud that's best for the MU or the situation at any moment in time is something that I feel people will value more as days go on.