Mine was alright - I listened to her but alongside other sources (nhs weaning website for example) and made my own decisions. Some of what she said i didn’t agree with completely but there was nothing wildly out of line.
She’s not hugely wrong on weaning - porridge and weetabix are perfectly good breakfasts for babies - and it’s totally fine to give cows milk in food although you can start with baby’s usual milk. I’ve been giving cows milk on porridge (not baby porridge just the normal stuff) since DD was about 7 months I think.
I personally think introducing a wide range of tastes, textures and food groups from early on is a good thing. We did the veg led weaning for about 2 weeks too, but she was definitely ready to move on and doing that for months wouldn’t have been enough for her. It’s also important to introduce allergens early on - so things like egg, nuts, and introducing wheat eg in the form of pasta is a good thing too. You need to be giving iron rich foods as well as baby’s supplies of iron have depleted by 6 months, they don’t get it from breast milk and although formula is fortified it’s not the easiest to absorb that way. Meat is a good source of iron but not the only one of course. There’s other important nutrients too.
As for them being on 3 meals - just go at the baby’s pace. My DD was probably on 3 meals by about 7 and a half months. She was ready for it, and enjoys joining in family mealtimes. She’s nearly 1 and eats a wide and healthy diet and enjoys joining in family mealtimes, I’m glad I didn’t limit her and that she had loads of practice. You’re right there’s no huge rush and it might be your DS isn’t ready for 3 meals at 7 or even 8 months, but you might find he is. You seem to object to the idea of ‘filling him up’ but that’s kind of the point isn’t it? I wouldn’t over worry about dropping milk feeds but again, you might find that he’s ready to after a while. I stressed about it with DD but looking back she let me know when she was ready.
I really rate the NHS Healthy Start website for info on weaning, as well as SR Nutrition who has a great blog and tons of information on her Instagram account. She’s a child nutritionist - she has a book out but I just used the free stuff online.
Sleep - I’d ignore that, as I ignored my own HV’s ideas about sleep. If what you’re doing works then it works.
Toothpaste - depends where you live. Baby toothpaste doesn’t have as much fluoride added to it. In my area we don’t have much fluoride added to the water either so the advice is to use (a mild) adult toothpaste for the whole family. My HV didn’t actually ever tell me that other local mums did and was confirmed by the dentist.