Again true … the great masters composed almost on few instruments, I think it was often piano like, violine, flute etc.
Well, for Bach, he had not only one “piano”, I think it has been invented during his life-time, he started with violine, and at least after becoming a renowed composer, he owned harpsichords and played organs. Organs have been the Modulars of his era, expensive, big, complex, and almost never owned by the performing musician But he used all those instruments and composed for orchestras. So he used the manyfold sound sources of his time to create great compositions.
As many have posted already. The problem seems not to be having access to gear, it’s about having to find focus. If we get more and more gear in the studio in too a short time, we tend to get lost, which is normal … but if we believe that the next new gear will push us forward to new creativity and a great track, this is definitely a kind of self-delusion.
Any decent sound source, played live or programmed can inspire us. We have only to let it happen and try not to overwhelm ourself with too many options at one time. But there is nothing to say against starting simple and grow step by step from one single voice to an orchestral arrangement …