One major difference from previous coronations is the number of guests. In 1953 more than 8000 guests (according to one newspaper article) were seated in Westminster Abbey. Due to fire and safety restrictions, this will never be allowed again, I believe. They have announced there will be approximately 2250 guests, similar to the funeral for Queen Elizabeth.
With only 2250 guests, the selection of guests will be more difficult for the coming coronation than for previous ones. All peers used to be members of the House of Lords, and it was logical to invite them as representatives of a branch of government. Nowadays, most hereditary peers are not members of the House of Lords, and have no formal position in society due simply to their title.
There are many other officials who would be more logical to invite to the coronation as representatives of the country: elected MPs, senior government officials, diplomats, Mayors and Lord-Lieutenants from around the country, civic and religious leaders etc. With 800 members of the House of lords and 650 members of the House of Commons, not all members of the Houses of Parliament can be invited, and there won't be room for the spouses of those who are invited.
Thus - I agree with Janet, there will be very few aristocratic ladies wearing grand jewels. Hopefully the dress code will allow for royals, their relatives and other senior ladies to wear tiaras, but compared to previous coronations there won't be many.
Then it's really not a Royal house anymore then, noble and aristocratic families exist because of a monarch, if their numbers are limited then their is really no point in hanging onto any of the other cultures and traditions. The status of Dukes, Marquess, Earl, Baron and lord were all given by a reigning monarch to pass from the holder to the heir. But if that's what the advisors and wokedom has done well I guess it's the new normal. I was hoping for the real traditional coronation even without the silk stockings but not to have most of the aristocracy on mass not show up is sad.
There have been lots of press reports of many noble families whose ancestors have attended coronations for centuries not receiving an invite as they have no political role anymore and no personal connection with the Royal family.
I suspect we will see the Duchess of Norfolk and Marchioness of Cholmondeley and a few others given the roles their husbands play in the Royal household and maybe some others with personal connections to the Royal family like the Duchess of Devonshire and the Dowager Duchess of Westminster and probably her daughters, certainly her eldest who is married to one of the King's godchildren.
I doubt there will be dozens of noble women though.