SouthEastBuses
On Moderation
It's not just you - there is a lot of pressure to have a service from Reigate/Redhill to Haywards Heath, Burgess Hill and Brighton. GTR said that the fifth most popular purchased ticket from Redhill stations is to Brighton (when they were discussing May 2018 timetable changes) but there is no direct service service from Redhill heading South of Gatwick towards Brighton. So everyone has to change at Gatwick - which with no works on platforms 1- 3 in the current upgrade means it will remain as awful as it is now.
There is no capacity North of Redhill towards London for extra services (6 is what GTR/NR say is maximum), but there is room for extra services Southwards (according to GTR again), thus the most likely way of getting a service from Redhill to Brighton is apparently to use North Downs trains and extend from Gatwick. Not that in reality it is likely to happen.
A train from Reading (or Oxford) to Brighton would be certainly be a good idea. It would give the popular tourist town an easy access from more destinations around the UK. Makes me wish they had kept the Cross Country service that once ran directly from Manchester to Brighton. But time to stop right here as I feel like I'm going too off topic.
At this point, if there is a Oxford/Reading to Brighton service, it might as well stay as GWR using 769s.
Just remember everyone, I'm an open minded person so I'm open to many suggestions and ideas

You mean like the Southern peak services from Guildford to London via Bookham?
If the world just revolved around me I would love a direct service from Reading to Haywards Heath or even just Guildford to Haywards Heath. However it wouldn't be a good use of resources. At least one can get a train from Guildford to Gatwick Airport. For a time even that wasn't posisble!
I do however like the idea of trains running to Cranleigh. Whether it meets any business case in the current climate is another matter.
And for me who has to commute from Horsham to uni in Oxford, it certainly helps! I wouldn't be too happy if that service was scrapped!