Long post but please read 
I think we're a little bit stuck in a discussion of for/against a choosable option in this thread so if we can agree on some basics I think we can avoid misunderstandings and make this a win/win for everyone.
1. If we get this "Lock per performance" mode in an update it will of course be an extra option and not harm the way Kemper works now. Everyone gets to choose if they want to have nothing locked, effects slots locked globally for the whole unit or locked only in some chosen performances.
I would personally use all 3 (or at least 2) of those modes in different situations:
I would have some performances made for specific songs when it's required where nothing would be locked and I could have radically different settings for Intro-Verse-Chorus-Solo... and so on stored att buttons 1 to 5 in that specific performance. (This works fine in some cases with a fixed setlist but if I'm at a cover gig with a repertoire of 500 songs to choose from and the singer shouts out a song title and key there is no time for scrolling through song specific performances when you hear the drummer go "1-2-3-4".....)
Then I would have some generic performances made for different types of music (pop/rock, country, jazz, metal...) to start from and use Lock per performance for chosen effects so I could change the amp/gain/sound (Rig) with buttons 1 to 5 for dynamic changes in the song, still keeping let's say my slapback delay on most of the time if this was a Country-Performance.
2. I don't think we as users need to find technical hinders for implementing this function, like coding and so on. Helix has this option and it works fine so I truly believe that a slight tweak of an already existing Lock-function is much easier for the Kemper team to manage than it is for the Helix team to make their product sound as good as the Kemper profiles 
3. This is not really about the Lock options but I read somewhere in this thread that there are only 4 buttons you can use to turn on/off effects with so as a tip if you didn't know there are more buttons you can use if you want. On my Kemper Stage and the remote to my Kemper Rack I use the buttons I-II-III-IIII to turn FX on/off but since I never use the looper I have adressed that button to turn on/off another FX slot. I use a Mission expression pedal with a built in toe-switch which turns the wah on/off in yet another FX slot. When the pedal is in heel-position the tuner shows up so I don't need the TUNER button either so I set that switch to turn yet another FX slot on/off. The possibilities are endless AS LONG AS YOU HAVE THE "LOCK PER PERFORMANCE" OPTION 
4. To those who don't have a need for this function: Please support us who need it and you can use your Kemper exactly the way you have done before. Who knows, when the option is there you might one day use it if only for just one song. Just like if someone asked the Kemper team for yet another fuzz or maybe a new FX that makes their guitar sound like a hairdryer. I personally wouldn't use it but let 'em have it. I'll just leave it off, no problem.
After all we are just a big Kemper family! 