Please explain the harm caused by waiting

[ohthelights]

I have a DS aged 2 and a half. He has hypermobility (I'm told this affects potty training somehow so thought I'd mention). He isn't going to nursery and won't start school until he is 5. So I'm in no rush to start potty training. I thought I'd wait until the summer so that we can spend our days in the garden or the park/field down the road. That way, if he has an accident, I won't be stressing about carpets, sofas etc getting soiled.

The problem is my MIL. She will not leave it and go with our wishes. She keeps pushing for me to start potty training and is getting quite critical.

My DS has no awareness of when he needs a wee and is only just beginning to realise when he needs a poo, but even that is only about 70% of the time. A lot of the time, we open up his nappy and there's a poo even he wasn't aware of!

So what harm am I causing him by leaving it until May-June? Do we really need to start now? He's got no interest in the potty or toilet.

I work in a Pre School. In my experience boys are normally almost always later than girls to potty train.
I only have daughters and my 2 were 2 years and 8 Months 2 years and 7 Months
Although I did try the sending one a bit earlier but she just wasn’t interested.
In my experience and from courses I’ve been on etc If they show zero interest you can’t do it. By them showing interest you’re halfway there.