The main benefits of fabric glue is that it can be used without mixing or diluting, it doesn't need clamping as it sticks right away, but still allows the fabric to be stretched to position it exactly before it fully sets, so the warp and the weft can be adjusted to be straight and properly lined up. It's also flexible, colourless and waterproof. No doubt other adhesives can be pressed into service, but it makes sense to me that when sticking fabric, to use fabric adhesive which is formulated for exactly that task and 'ticks all the boxes'.
Hobbycraft do a 60ml bottle for only £2.00 which gets good reviews.
https://www.hobbycraft.co.uk/superio...ml/631504-1000