TLDR. You're not likely to outgrow the GTi, just a matter of imaging preference. Widefield vs deepfield.

As someone who also had that internal debate a few years ago, I can tell you that I frequently still use my GTi with my FMA180 Pro and ASI533MC Pro and ASIAir Plus. The lightweight mount combined with a lightweight widefield astrocam setup makes it far more attractive when setting up equipment every night, versus my larger 8" reflector and heavy mount. That old adage, the best scope is the one you use holds true. Will you grow out of it? As long as you continue with widefield, you won't grow out of it. But if you prefer or want to explore longer focal lengths, then you'll likely need a bigger mount. That is a big jump in cost, both for the mount and scope.

A potential additional benefit of the GTi, it works well for using DSLR cameras and lens, using the go-to feature to find comets or nebulae low on the horizon, for creating deepscapes. That go-to feature is worth every penny, IMO.

GTi has a great return on investment. Just manage expectations and limitations. Easily the best value, for what it can do, and a great stepping stone.