Agree the potential exports are purely opportunities with hindsight. But the LHD concept was well established with the USN (they were on their second class?), was just logical and common sense, which the: Spanish, French and RAN went with.
The RN didn't even go with the idea with the Albion/Bulwark, just buildig 2 dull LPD. The Fearless & Interpid had always been under pressure to justify their role and it is hardly surpising one has already been "reserved".
Once again unimaginative old concepts.....oh and I am not even talking about the Type 26!
The LHD concept was established in the USN in the late 1970's with the Tarawa class but you can't seriously compare any European navy to the US. A small detail is that the USN can impose a 500 mile bubble of air dominance over any landing zone by virtue of 13 Carrier Battle groups, scores of cruisers, destroyers, frigates and SSN's and a USMC plus reserve that was bigger than the entire cold war British Army. The USMC mindset about opposed landings was also entirely different from that of the RN.
The RN and 7,000 man RM was tasked to defend the Norway flank, trying to prevent any soviet move down from northern norway and for that Intrepid and Fearless and civvie RoRo's would have been used. Certainly in the 1980's there was no real budget as the money was going on SSN's, Type 22, Tornado etc etc.
Also look at the RN's experience of real combat. There are pictures of Daggers and Skyhawks flying mast height over Fearless and Intrepid, how they weren't hit was a miracle, but could a 22,000 ton ship docked down, with a deck packed with helo's and supplies survived in that scenario? So post Falklands there was a view that survivability would be an issue and no real budget in any case and a very specific mission that didn't really warrant LHD. The RN was never going to do an Iowa Jima but it might do a pebble island style helicopter insertion.
Then you come to the end of the cold war and a period of change and uncertainty. GW1 was basically cold war weaponry, then we come to the balkans conflict , where lighter forces were used. In the late 1990's There was limited money and the RN was allowed a aviation support ship for less than £300m, if there was a dock involved , the ship wouldn't have been built for that price and so no Ocean at all. At the time of Oceans development contract there was still no euro contemporary LHD.
You could argue that the Albion's should have been built with more aviation capacity, but again, budget and existing fleets dictate. Ocean was just in service so had 15 plus years on the clock and the three invincibles had 10-15 years on the clock, so the RN had plenty of potential for aviation operations (and only 3 x 9 sea king commandos anyway?), with limited numbers of Sea Harrier there was plenty of spare deck space, so could you justify adding hugely to the cost of the albions or building them as flat tops? I'm sure when Albion, bulwark and Ocean get replaced it will be with LHD , BAe already have the graphics of a concept online, but it needs a big portion of hindsight to criticise the RN for not building them earlier.
We are only seeing nations such as spain, france and australia going the LHD route now because it is cost effective for todays world, none are expected to do opposed landing , nor is there an obvious need for high intensity war fighting, hence the canberras for instance are lightly armed. Those nations have run there existing amphibs into the ground before they replaced them, I don't think they possess more logic or common sense than anyone else.
When it comes to capacity , our LPH, LPD, Bays, Merlin, lynx, Apache, 3 Cmdo brigade and supporting elements stack up well against the capabilities of Spain, France and Australia , and in a few years we will be on par with france again with a CTOL carrier.
As for the Russian Mistral deal, its not the 20,000 tons of ship they want, its the command and control system and anything else they can get Thales to provide. Your use of hindsight is truly amazing, though not really surprising as your ideas are often "off the wall", it was just a few months ago you had won the falklands war with a few Chieftan tanks.