Should you buy 5G smartphone in 2021 lets find out, In April 2019, South Korea and the U.S. became the first countries to commercially launch 5G services. Ever since 5G launched, It gradually slated to replace the 3G and 4G cellular telephone networks and promises to speed up the rate of data transfer by 100 times or more, greatly reduce latency and allows wireless connection between devices which makes the cellular network more efficient.
5G is the fifth generation technology which is developed to deliver faster download speeds than ever, real-time responses, enhanced connectivity, giving businesses and consumers the potential to experience new, innovative technologies.

It can work as an alternative or a solution where there is no WiFi or only very slow WiFi speeds are available. however, it is not the alternative for WIFI.
5G is the fastest mobile network technology available real-world download speed is around 100-500 Mbps with less than 1ms latency, however developers claims 20 Gbps. while 4G offers maximum real-world download speeds up to around 5-50Mbps with 10-50 ms latency.

It means Downloading a high-definition film over a 4G network, lets say, takes 50 minutes then 5G will take only 9 minutes.Connectivity requirements vary based on what the network is being used for.
Streaming a film on your smartphone and driving your connected car, demand different connectivity levels that aren’t always available with 4G.
Currently, there are about 61+ countries, where 5G is used commercially including the US, China, South Korea, United Kingdom, Spain, Canada, Australia, Italy and many more.
30% of the world is using 5G network right now and the numbers are growing
Still we are yet to see 5G in developing countries like India.
There are no astonishing new 5G features yet, but it improves the speed of existed application. Right now, only a few airwaves are designated for 5G, and there aren't a lot of 5G phones out there. So, I would suggest getting a 5G phone over 4G phone, as it's the HOV lane of the mobile network. In crowded conditions, when 4G networks choke up, your 5G connection may still be clear.
5G upgrades get better every year. If you are intending to keep for 2-3 year, The 5G will be a good choice.

Our answer is yes, if it supports most bands then go for it, if it supports 1 band for 5G then it might not be a good option for now.
So the answer for whether you should buy 5G smartphone in 2021 is upto you, depends upon the use case scenerio, if you have a good wi-fi connection and occasstionally switch to network then 4G will surfice the need for approx 2 year.
If the carrier you are using already have 5G implemented and supports the 5G band your phone will offer then go for it, as sooner or later it will be used widely.
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