Using a weekly locks you into a consecutive 7 day period (after validation), yes.
That is the only reason why a weekly would be priced the same as a 5 x Daily or 10 x 2-hour, or else nobody would buy them (preferring the former instead). The latter two options give you more flexibility, so you have to pay an extra cost for it (costs the same as a 7-day period).
But between the latter two options, the 5 x Daily is actually completely redundant compared to the 10 x 2-hour. The 10 x 2-hour should cost a bit more, because if you use more than 2 trips per day on your 10 x 2-hour, the second trip will last until 3 am the next morning, which means you effectively have 5 dailys, with added flexibility. For example, you might only need to use one 2-hour trip on the weekends rather than for a whole day, and with the 5 x Daily, you would consume one-fifth of your ticket, whereas with the 10 x 2-hour, you would only consume one-tenth of your ticket. There should be a price for that added flexibility, but there isn't, so there is absolutely no reason to buy the 5 x Daily - get the 10 x 2-hour instead, it does everything the 5 x Daily can, but better.
I guess maybe the added cost of having to remember to validate on trams and at suburban train stations (that have no barrier) with the 10 x 2-hour may offset the benefit of added flexibility, I'm not sure

. Although, in terms of deterring users from fare evasion, flexibility is a cost to Connex: fare evaders can freely validate only when necessary, and are not bundled into paying for longer time-frames than necessary. It is in the interests of Connex to charge you more for the flexibility, and it also makes sense to charge more for the added convenience of flexibility for the consumer - an example of a win-win situation for the consumer and the supplier.
Haha... that's Collin's economic analysis of the day.
This should simplify your choice to one between a Weekly and a 10 x 2-hour. Keep in mind that the 10 x 2-hour essentially offers 5 daily trips, unless they are within 2 hours (or up to 3 hours, since it rounds
up to the next hour), which will offer more. The weekly effectively offers 7 daily trips within a week. Assess what type of travel you are doing in a week, and compare.