That kind of wireless speed is usually only at close distance.
Anyway, with promotions liike M1 6Gbps plan, the main reason why people go for higher speed plan is that it has chaper effective pricing than 1Gbps plan, considering the cost of the bundled router.
Example: for new users, M1 1Gbps with lousy EX520 router is at S$29.90 per month, M1 6Gbps with much better Archer BE805 is at S$34.90 per month. It is a no brainer for a new user to sign up the 6Gbps plan.
https://shop.m1.com.sg/fbb/plans-bundles/fbb-plan?plan=HOMEPAC_1GBPS_24
https://shop.m1.com.sg/fbb/plans-bundles/fbb-plan?plan=HOMEPAC_6GBPS_24
In any case, no more 1Gbps plan from other ISPs, other than M1.
Singtel --> mainly 3Gbps, 5Gbps and 10Gbps plans. Still got niche 2Gbps plans.
Starhub --> 3Gbps, 5Gbps and 10Gbps plans.
M1 --> 1Gbps, 2.5Gbps, 3Gbps, 6Gbps and 10Gbps plans.
MR --> 3Gbps/10Gbps plans
VQ --> 3Gbps/10Gbps plans
SIMBA --> 10Gbps plan
WC --> 2.5Gbps/3Gbps/10Gbps plans.