The answer here is "kind of". Here's the main issue - game development is expensive. AAA studios are expensive and cost a lot to run, assigning a AAA studio a remake/port project is not really worth it when compared to the estimated return on investment. Instead, what game publishers often do is contract out the remakes/port job to an independent third-party studio. This has two major benefits.
First, it costs notably less than the publisher putting their own internal AAA studios on it. When you're doing a remake/port, you often don't need super high fidelity assets or extremely large scope - the majority of the gameplay design and systems already exist. Contracting the project out to an external studio means the publisher can just pay a flat amount and doesn't have to worry about things hiring new people, handling benefits, setting up the studio, etc. The external studio gets to do that, and often has their own stuff in place already. This works very well for the independent studios too - they can take jobs like this in order to pay the bills and fund their own game development. Behaviour, independent developer of Dead by Daylight, also has a second team that does work like porting and remakes/ports for other studios. Their porting and remake team provides the income to keep the studio afloat during leaner times.
Second, it allows the publisher to give these external studios a chance to prove themselves - can they deliver a promised project in time, budget, and quality? If they can, this studio may be worth acquiring or working with again. The Legend of Zelda: Echoes of Wisdom was developed by Japanese independent studio Grezzo, but this is far from their first game for Nintendo. They ported Ocarina of Time 3D, Majora's Mask 3D, and Luigi's Mansion for the 3DS, and they did the port for Link's Awakening to the Switch. The team that built Sonic Mania first proved themselves to Sega by doing iOS ports of Sonic CD, Sonic 1, and Sonic 2 before being given the Sonic Mania project.
With these two reasons in mind, doing remakes/ports do two things. First, they can earn money to pay the bills in a situation where it isn't worth it for the publishers to build them internally, allowing these studios to build their own projects or just have a more stable sustainable situation. Second, it provides a "minor league" situation where these external studios can prove their ability to the publisher in a lower-stakes situation in order to be entrusted with a higher and more interesting project later. As long as remakes and ports of games continue to do well, this kind of work will be in demand.
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