Also remember that the 444s were ordered for the Portsmouth line mostly and to supplement 442s on semi fast Wareham/Poole services.
Forget any ideas that trains originally ordered for a particular line should stay there until scrapped. The railway is now run at minimum cost by TOCs trying to maximise their profits. The seemingly wierd logic of 444 and 450 deployment on the Portsmouth (both routes) and SWML services is primarily to level unit mileage in line with SWT's contract with Siemens and provide a minimum service that the DfT requires at minimum cost. This juggling goes on everywhere and in the case of routes like the Portsmout Direct, may involve high density trains like 700s where adequate seating can be provided off peak and south of the metro area (i.e. Guildford). The width of 2+2 seats may be less than some would like but that is probably better than leaving passengers on the platform because there are no seats and not enough room for them to get on.
One thing that hasn't been suggested, thankfully, is setting down and picking up only rules. This doesn't work in peak hours (see FGW thread on 19:15 train) and certainly wouldn't appease (most of) the commuters.
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Absolutely correct! Commuters will complain about Pullman dining cars at Standard Class season ticket prices, until they are taken away from then. Then they will claim that they were 'theirs' so they have a right to them.

OT, but an example of this phenomenom, the 387s have been well received on Thameslink services this year, but just wait for the wailing next year when they are replaced with 700s.
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I wasn't expecting any 700s to work the Portsmouth Direct line.
My reference to 700s was about the the type of train that could handle the peak load, albeit with many standing, but that is better than leaving passengers waiting on the platform.
A 12-car 700 has 666 seats (a devil of a number

) and is also designed to take a further 1000 standees. That would clear almost any queue in the peak. 666 seats would probably satisfy the off-peak trade, and unlike the Thameslink sets where dwells are critical, passenger comforts like (narrow) armrests, drop down tables in airline seats and USB charging points could be added to sell more leisure travel.
The Bombardier Aventra and Hitachi A series range would probably have something similar to offer, but SWT seem to be going for Siemens again with the 707s.