Yes, that’s probably reasonable. The biggest problem in the planning system is elected Councillors ignoring planning legislation and their own Council’s policies to object to applications so they can get voted in again. They need to be made more accountable for when planning appeals against those decisions get upheld. I’d like to see numbers published for Council costs arising from refusing applications against their officer’s recommendations at the very least and also where appeal decisions go against them.
Off topic and not part of my disagreements with aspects of Rayner's legislative plane but re: planning: It varies. I follow local planning in fair amount of detail and regularly submit input to applications (incl. supporting applications the "community" objects to where I consider it an important development).
My local planning dept (not Councillors) seem to make decisions based on probability of appeal outcome. eg one development (house extension to GII listed building) everybody incl. Planning objected to (I spoke to them and verbally they said "Don't worry, it'll never get approved") then applicant wrote a threatening letter about how his lawyers advise it will be approved on appeal so if refused he would be appealing, etc. and ... approved without going to committee. Area where I live I think virtually all appeals are not upheld, maybe because planning approve anything that might risk an appeal being upheld.
But for the majority of small developments <1 house eg extensions, outbuildings, etc. the standard practice here seems to just build then when caught apply then if necessary appeal. Sometimes happens for residential properties occasionally and people just threaten a way under-resourced enforcement last one near me lost appeal and was "on hold" as applicant had notified they were going to Judicial Review (where it would never be upheld).