I agree with the OP. Far too many people are totally unsuited to running a business. Despite what some posters have said, there are usually very few barriers to setting up a business in the UK and that's the problem. Many trades/professions have very low barriers to entry, meaning literally any Tom Dick or Harry can start one. You're often disadvantaged if you try to do things properly, by having taken professional qualifications etc because you're then bound by your professional body rules which someone without qualifications doesn't have to comply with. In the UK, anyone can start a business at a moment's notice as there is no official approval procedure (unlike many other countries). If you wish you can form a limited company in an hour or so for just £15 (or even free with some formation agents). You can register as an employer or for VAT with just a few clicks on the gov website which laughingly people regard as some kind of "proof" of your legitimacy. You can get your employers liability by a few clicks of your mouse for a couple of hundred pounds in just 5 minutes. I'm really not sure why so many people think it's so hard and full of hurdles to start a business - anyone can do it in an hour or two. That's why we have so many "rogue" tradesmen, amateurs, etc - uninformed customers think that a business being a limited company, being VAT registered, having staff, etc makes them legitimate - it doesn't at all - they're all so easy to register for.
Of course, starting a "proper" business, and doing things properly and by the book is a completely different thing. Especially if you have to deal with your local council for food hygiene, H&S, planning permissions, lease of premises etc - local councils are often absolutely awful to deal with and everything takes months. Same if you want to do it properly with a professional or trade association - you have to jump through their hoops at their speed, which those who don't have trade/professional qualifications don't have to bother with.
So, yes, if you want to do things properly and have qualifications/professional body behind you etc., then it can be hard to jump the hoops, but sadly, the travesty is that it's unbelievably quick and easy for people who want to set up in a shoddy manner, without professional body, without qualifications, etc to set up, often in direct competition. It's such a shame that customers/clients don't really understand that and will often select shoddy businesses just because they're cheaper and then whinge on SM about the entire profession in the ignorant bliss that they weren't actually dealing with a professionally regulated firm in the first place!
It''s like the firms who whinge that they can't get council/public sector contracts because of the formalities of the tender process etc - basically just checking they have pl/product insurance, H&S policies, HMRC registrations, professional/trade body registration, complaints procedures, quality control, etc. Er, yes, that's what "proper" business is all about! Your local hospital really isn't going to give a contract to Joe Bloggs who has no professional/trade qualifications and pays his unregistered workers cash in hand every Friday.