I mean I can't remember a single period where they didn't have like 3 other teams that posed as big a threat
Sorry, just been reading back to try to get my head around your argument. Whilst I fully agree that England are significantly better than the competition (due to being professional the longest), you've presumably forgotten about 2021 & 2016.
Currently, ranking points from England down to Canada / NZ / France (2nd - 4th) is a spread of 7.5-12 points
2021, ranking points from SA (men) to NZ, Eng, Ire is a spread of 5-9.5 points - so not quite as severe, but really not "as big a threat"
2016, ranking points from NZ (men) to Eng, SA, Aus is a spread of 7-12 points
Again though, women's rugby is newly professional. Having a head-start on professionalism is an undeniable advantage.
Women's rugby has been taking off in England over the last 4 years - and is only remotely this big in England*. It's really shouldn't be a surprise that England dominate.
Women's rugby became as popular as it currently is, whilst the most famous player played for USA, and points differences of 50+ points were common when a tier1 side plays tier2. It's unlikely to be harmed by... the exact same scenario as made it popular in the first place - even if that scenario is not ideal, and we'd all prefer more contests, and more teams coming up to the level of England - which they will - in time (with investment).
* 3 years ago, England v Wales in the 6N set a world record for attendance at a women's rugby match, with 14k. The entire RWC in NZ that year sold something like 40,500 tickets over the entire event.
Yesterday saw a football stadium in Sunderland (!) sell 42k tickets, the biggest ever for a women's XVs match (Paris olympics got 66k), Twickenham has already sold out for the final.
First international rugby match for the women was 1982 - more than a century after the first men's international (1871).
Comparing all of that to men's rugby is literally men against boys. One is a mature sport which has been professional for 30 years. One is a juvenile sport, which has been professional for 3 years. These things are simply not the same.
None of which means that you had to enjoy the rugby, or the experience, or that you have to think it has much of a future - that's all fine.
If it's that it was a blow-out, then be aware that it was always going to be a blow-out, and watch something like Scotland v Wales this afternoon, which should be way closer.