From an energy policy perspective, it doesn't make sense. Incentives have to be created somewhere to switch from fossil to electrified heating.
But that is currently irrelevant. The cap serves to cushion social hardships and is temporary. It has nothing to do with climate targets and medium/long-term energy policy.
And in my opinion, it is harmful because it massively distorts price signals. If the cap is at 40 cents, any supplier can, for example, charge 60 cents and massively enrich themselves from the tax fund. The consumer doesn't care, they only see the 40 cents. They also don't need to switch providers if everyone charges 40 + x cents anyway. All the same.
Absolutely stupid and should apply for a maximum of one season.
Apart from that, no further incentives are needed for heat pumps, photovoltaics, or anything else. We already have massive excess demand, so there is no need to pour even more money into it. That only drives up the profits of dealers and craftsmen; the problem is availability. Vaillant currently 10-12 months for private customers, I was recently told.