In an ideal world no one would bother where power comes from. From "the grid" or "from local". Why should "the grid" get some benefit? Over local production? IMHO such a thinking artificially limits competition.

What should still bother the law makers is the impact "grid power" vs. "local power". E.g. if AI computing centers build gas turbines for local power, but that creates noise and air pollution.

"Balcony solar"'s idea is to get solar into the hand of people without almost no extra cost. By design, you can plug it in into a normal socket. So you don't even need to call an electrician. No new power cable needs to be installed. And the basic idea of this ("make it so simple that even 85 year old Aunt Mary can do it") is IMHO worthwhile.

For a regular solar, you need to check if your roof can withstand the weight and wind forces. You need to install electric lines, circuit breakers etc etc. All of this costs several factors more than the pure voltaic panels.