Well, despite the cost difference ETA movements are proven to be reliable. A better analogy is the Mazda RX-7. Let's say Mazda had two versions of the RX-7 on sale, one with their rotary engine and one with a Chevrolet LS engine. Rotary engines are cool and unique, but have a lifetime of between 100-150k miles before a full rebuild is necessary - and you will have to locate a tech who is capable of working on them, which is quite rare.
On the other hand, you have the boring old LS engine, which makes wayyy more power than the rotary, costs far less, and will likely outlive you.
Most important, if your LS breaks down for some reason, you can have it serviced at any GM dealer, and basically just about any private shop. You can shop around to find the best shop with the best rates, which will be far far lower than the rates for the rotary specialist.
And then, what if Mazda goes out of business in the future and no longer produces spare parts for rotary engines...? Sure, GM could go out of business as well, but there are more than enough LS engines you can easily cannibalize for parts if need be. This is essentially the case with ETA / Sellita movements vs. in-house.
So, in-houses are definitely cool, and do indeed lend a certain credibility to a watch model or brand, but there are advantages to buying watches with proven, reliable off-the-shelf movements.
I don't care for any modern Rolex model as I find them a bit too blingy for my tastes, but it would be a mistake to dismiss them out of hand since they are a formidable builder of quality, dependable watches. Hopefully someday they'll go back to the simple lovely designs of the 1016 or 1675.
As far as Alex Monopoly is concerned, I imagine he must be popular with millennials? (As one myself, this mystifies me, but then I'm a watch nerd) TAG has concerned itself by thirstily chasing any brand ambassador who they think will be popular with millennials, without having any common thread between them other than that they likely have massive Instagram follower counts. I don't think this is a cohesive strategy and likely won't make a whit of difference since most millennials have well-documented financial struggles given the current state of the world economy, the rising costs of living / housing / education but stagnant earnings etc.
I do like the Lego man though!