Let's look at Rob's work record. Brian reckoned he had a good CV and presumably his references were checked before he was taken on to manage the megadairy. However, in practice he clearly wasn't that great and having walked out of that job many, many months ago he hasn't worked in his specialist field since, which is going to look awful on his CV now.
He interefered with the way the shop worked before when it was in Borchester, and it all went disastrously wrong. The woman he insisted was taken on as manager was useless. The shop had to be closed down because it wasn't making any money. Why didn't anybody query whether he knew anything about retail management before he was allowed to make that appointment and take on a supervisory role there?
Since then he's tried to interfere with the tearoom and he's pushed through his vision for the shop, all without the faintest understanding of either business, and yet once again his mesmerising effect on the BF Archers means nobody has really stood up to him on any of this, except Tony over the shelving/tables he bought which Rob tried to get him to take back. He messes up the ordering so he can gaslight Helen, and to hell with the effect on the shop's profits.
He is trying to rubbish Tom's products, which up to now everybody has always said were great. Tom's business presumably cross-subsidises other enterprises based at Bridge Farm, so if it failed it would endanger the whole farm.
He's got Helen scarcely leaving the house, so her cheesemaking must have ground to a halt, and that was another good earner for Bridge Farm.
He has no opinion of Fallon, Emma, Clarrie and I would assume Susan, for both snobbish and sexist reasons, so he sneers at everything they do. If he ever got control of Bridge Farm dairy he'd probably sack Clarrie and Susan and replace them with female equivalents of Toby. He would like nothing better than to evict Fallon and Emma, who seem to be doing well and are therefore good tenants/a good fit with the Bridge Farm businesses.
Surely somebody soon is going to say some of this out loud? It really does stretch credulity to the limit that nobody is querying why he hasn't got another job. How does he expect to support his family in the longer term with no salary except from the shop? Can't they see that the only reason for him to have walked away from his former career is because he wants to annexe Bridge Farm and run it his way?