"The cottage is the relevant bit ...have never been fussed about cottage type holidays as it does just seem like same shit, different place."
You're totally entitled to your opinion about what you want to do on holiday, and what you do not want to do on holiday. So, in that respect, of course you are NBU.
In contrast, for me personally, I have a very different opinion. When I was younger, I regularly travelled, both in this country and abroad, as part of my job. I grew to hate staying in hotels.
I must admit that we have only rented a cottage a couple of times in the UK (it was mostly abroad). But the only cleaning we ever did was to do the washing up and put any rubbish in the bin.
Likewise, whenever we have stayed in cottages or homes abroad, it was the same thing; we would do the washing up and put the rubbish in the bin. And that's all (for context, this wasn't through AirBnB or similar but through companies that specialise in holiday homes/villas).
Self-catering accommodation gives you the choice of either going out to local shops and finding interesting things to cook or going to local restaurants - it's totally your choice - rather than being forced to eat at a restaurant for every single meal of your holiday.
"No on-site activities is also part of it."
I'm not really sure that most hotels provide "on-site activities" as a matter of course (and certainly not included in the price - these are usually optional extras or included in a package deal).
However, if you are into water sports and other outdoor activities, then there are some really great hotel chains that do have a whole load of on-site activities.
One such company is Mark Warner (mostly in Greece and Turkey) but Neilson also operate in this area and, arguably I would say, are rather better.
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But, if you want on-site activities combined with self-catering in the UK then there are certainly lots of options. You may consider some of them to be beneath you.
These range from the likes of Butlins at the cheaper end to Center Parcs at the most expensive (although, Center Parcs is a lot cheaper in France and the Netherlands).
Center Parcs (more particularly, those in Europe) have a large range of family activities to take part in.
I grew up as a child spending my holidays at either Butlins or Pontins. Pontins mostly closed down in 2023 but Butlins is still around.
Both Butlins and Pontins were very much about entertaining the masses while on holiday at places like Bognor Regis or Prestatyn.
I remember there being shows put on every evening (in the same way that there are on cruise ships these days) and there were lots of different activities during the day as well.
Just as an aside, thinking back about it now, I was (and still am) surprised that there was a snooker hall with a dozen or more full-size snooker tables (about 3.5m by 2m). We went in there once and I was really surprised that it was absolutely full of men playing snooker (for context, this was back in the 1970s).
So, I would say, you are definitely not BU to want what you want.
However, if you are looking down on people who want something different then you would BU